1998 Western Pacific Geophysics Meeting Special Session Descriptions

If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

ATMOSPHERIC SCIENCES Section
GEODESY Section
HYDROLOGY Section
     OCEAN SCIENCES Section
PLANETOLOGY Section
SEISMOLOGY Section
SOLAR-PLANETARY SPACE PHYSICS AND AERONOMY Section
TECTONOPHYSICS Section
VOLCANOLOGY, GEOCHEMISTRY, AND PETROLOGY Section

Atmospheric Sciences (A)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

A01   Effects of Aircraft Emissions Over the Western Pacific
Major subjects in this session include emission inventory and trends, homogeneous and heterogeneous chemistry, transport and radiative processes, formation and effects of contrails, and assessment of climate and environmental impacts.

Conveners: Jen-Ping Chen, National Taiwan University, Department of Atmospheric Sciences, #61 Ln 144 Sec 4 Keelung Road, Taipei, ROC 10772, Taiwan; e-mail: jpchen@water.as.ntu.edu.tw; Ivar Isaksen, University of Oslo, CICERO, Institute of Geophysics, P. O. Box 1022, 0315 Oslo, Norway; Phone: +47-22-855822; Fax: +47-22-855269; and Wei-Chyung Wang, State University of New York at Albany, ASRC/CESTM, 251 Fuller road, Albany, NY 12203; Phone: +1-518-437-8708; Fax: +1-518-437-8758.

A02   Greenhouse Gas Emissions of the Pacific Countries
Major subjects of the session include sources, environmental conditions, and sinks of greenhouse gases and their mitigation.

Conveners: K. Minami, Japan International Research Center for Agriculture Sciences; Phone: +81-298-386306; C. C. Young, National Chung-Hsing University; Phone: +886-4-286-1495; and Shang-Shyng Yang, National Taiwan University; Phone: +886-2-2362-1519.

A03   Atmospheric Chemistry Over the Western Pacific
Major subjects of the session include long-range transport of trace species, aerosol chemistry and radiative effect, photochemical processes, and acid deposition.

Conveners: Xiaoyan Tang, Beijing University; Phone: +86-10-6275-1925; Hajime Akimoto, Tokyo University, Research Center for Advanced Science and Technology, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan; Phone: +81-334-814502; Fax: +81-334-814562; and Chung-Ming Liu, National Taiwan University, Taipei, Taiwan; Phone: +886-2-362-3112; Fax: +886-2-363-3642.

A04   East Asia Monsoon and Climate
Major subjects of the session include diagnostic studies, modeling, and observations of the East Asian monsoon and climate. In particular, observations and issues related to recent field experiments (e.g., SCSMEX, GAME, KORMEX) are solicited.

Conveners: C.P. Chang, Naval Postgraduate School; Phone: 1-408-656-2840; Y. H. Ding, Chinese Climate Center; Phone: +86-10-6217-2277; Ronghui Huang, Institute of Atmospheric Physics, Academia Sinica; Beijing 100080, China; Phone: +86-1-2553220; Wen-Shung Kau, National Taiwan University; Phone: +886-2-2363-4705; and Wei-Chyung Wang, State University of New York at Albany, ASRC/CESTM, 251 Fuller Road, Albany, NY 12203; Phone: +1-518-437-8708; Fax +1-518-437-8758; Jough-Tai Wang, National Central University, Department of Atmospheric Sciences, Chung-Li 32054, Taiwan; E-mail:p230324@twncu865.ncu.edu.tw.

A05   Weather Dynamics and Simulation
Major subjects of the session include tropical meteorology and typhoons, mesoscale modeling, weather analysis, and forecasting.

Conveners: Bob Gall, NCAR; Phone: +1-303-497-8814; Ben Jong-Dao Jou, National Taiwan University; Phone: +886-2-2362-8962; and Xui-Ji Zhou, Chinese Academy of Meteorological Sciences; Phone: +886-2-2349-1120.

A06   Tropical Cirrus Clouds
Major subjects of the session include climatic effects of tropical cirrus clouds, remote sensing of tropical cirrus clouds, and interaction of tropical cirrus clouds with atmospheric chemical processes.

Conveners: Kuo-Nan Liou, UCLA, Department of Atmospheric Sciences, 7127 Math Sciences, Box 951565, Los Angeles, CA 90095-1565; and Jan Bai Nee, National Central University, Department of Physics, Chung-Li 32054, Taiwan; Phone: +886-34227151 x5310; Fax: +886-34251175.

Geodesy (G)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

G01   Geodynamics of Central, East, South East Asia and Western Pacific: New Insights From Space Geodetic Techniques (Joint with T)
The session aims to address geodynamics studies that employs space geodetic techniques, e.g. GPS, VLBI, SLR, PRARE, DORIS and D-INSAR, and focuses on the current behavior of Asia as a result of India's collision with and penetration into Eurasia, the current crustal motion and dynamics of E- and SE-Asia, and crustal deformation along the plate boundaries in the Western Pacific. Geodynamic studies relevant to study objectives under the Asian Pacific Space Geodynamics Project (APSG) are encouraged. Papers are especially encouraged which cover the topics including contemporay data analyses, modeling, and interpretation that deal with the current deformation of the Himalaya-Karakorum, mirs-Tienshan, evolution and current behavior of the Tarim and adjacent areas, and ongoing motions along major faults or fault systems, e.g. the Red River, Semangko, Tan-Lu, or Philippine Faults, and plate boundaries in the Western Pacific. The distinction between "long term secular" motions of blocks, seismic (elastic) motions, and creep within fault zones is both timely controversial scientific issues and a crucial issue for the interpretation of data. As a result, papers are welcome that can contribute to a better understanding of space-geodetically derived information on earthquake deformation and/or include new data and results on current creep, seismic coupling and others in the area.

Conveners: Chris Reigber, GeoForschungs Zentrum Potsdam; E-mail: reigber@gfz-potsdam.de; Zongjin Ma, State Seismological Bureau; Phone: +86-1-62356421; Fax: +86-1-62028617; E-mail: disastg@mimi.cnc.ac.cn; Teruyuki Kato, University of Tokyo; E-mail: teru@eri.u-tokyo.ac.jp; Gero Michel, GeoForschungs Zentrum Potsdam; E-mail: fault@gfz-potsdam.de.

G02   GPS and Small Scale Deformation Monitoring
GPS has been used to measure large scale crustal motion since the mid 1980's. The Asia-Pacific region is especially "rich" in active tectonic plate margins which are increasingly being monitored by GPS. In order to understand the geodynamics of the region repeat GPS campaigns have been mounted. However, there are many other types of deformation that may be monitored using GPS. For example, ground subsidence due to fluid extraction or underground mining, volcano flank deformation, tide gauge stability, and the movement of engineering structures such as dams, bridges, buildings and offshore structures. These applications may require GPS observation and processing strategies that are different from those used for traditional large scale geodynamic studies. At one extreme, the techniques may be based on commercial off-the-shelf GPS systems, or they may require the use of "scientific" GPS software. The monitoring systems may be GPS-only, or involve the integration of GPS and other technologies. The systems may be deployed on a permanent basis, or for periodic surveys. In this session, papers which describe the use of GPS for such deformation monitoring applications are especially welcomed.

Conveners: Chris Rizos, University of New South Wales; E-mail: c.rizos@unsw.edu.au; Jingnan Liu, Wuhan Technical University of Surveying and Mapping, Phone: +86-27-78852922 x2320; E-mail: jnliu@wtusm.edu.cn; Richard Coleman, University of Tasmania; E-mail: ric@topex.surv.utas.edu.au; Xiaoli Ding, Hong Kong Polytechnic University; E-mail: lsxlding@polyu.edu.hk.

G03   Sea Level Changes and Their Coastal Consequences (Joint with OS)
This session will be concerned with the measurement of relative and absolute sea level changes by means of tide gauges and satellite radar altimetry, in combination with measurements of vertical land movements through the use of the Global Positioning System (GPS) and absolute gravity. Changes on time scales from hours and days (i.e. tides and storm surges) through to interannual (e.g. El Nino) and century timescale (e.g. climate change induced) will be discussed. Particularly relevant will be papers as to whether the region has adequate sea level networks for its requirements (e.g. development of regional GLOSS activities), and papers conducted under the Asian Pacific Space Geodynamics Project (ASPG) on the monitoring and mitigation of sea level change in the Western Pacific and vicinities. Insight into the mechanisms of sea level changes from geodynamic, ocean circulation and climate models will be invited. In addition, sea level changes often have important consequences for people, industry and natural environments at the coast. Discussion will be invited on the regional space and time scales of such impacts and possible mitigating strategies.

Conveners: Phillip Woodworth, Proudman Oceanographic Laboratory; E-mail: plw@unixa.nerc-bidston.ac.uk; Cheinway Hwang, National Chiao Tung University; E-mail: hwang@geodesy.cv.nctu.edu.tw; Bill Mitchell, National Tidal Facility; E-mail: bill@pacific.ntf.flinders.edu.au; Samad Haji Abu, Malaysian Survey and Mapping; E-mail: samadabu@jupem.gov.my.

G04   Regional Geodetic Datum Realization, Maintainence, and their Compatibility with International Terrestrial Reference Frame
With the advent of space geodetic technologies, primarily due to GPS, and include SLR, VLBI satellite altimetry, and InSAR, it has become imperative for regional datum to address their definition of datum is compatible with existing global terrestrial reference frame definitions, such as WGS84 and ITRF. Traditional and regional datums may not be geocentric and/or the level of accuracy of their realization in the form of benchmarks is inadequate for modern applications. At the global and regional scales, horizontal and vertical datum realization is now indispensable for a multitude of Earth sciences. Aside the scientific aspect, the rapidly changing infrastructure of surveying and the use of space technologies in our daily lives revealed problems to be addressed in replacing and maintaining the existing datums at all scales. In addition to the use of GPS and other advancing space geodetic technologies, regional geoetic datums are increasingly being improved with the aid of such services as the International Earth Rotation Service (IERS) and the International GPS Service for Geodynamics (IGS). The former provides the establishment and maintenance of ITRF. We invite papers on both aspects, scientific and practical, of regional datum realization, unification and maintenance. Scientific papers on results for existing Projects such as the Asia-Pacific Regional Geodetic Project (APRGP), Asian Pacific Space Geodynamics Project, and others, are particularly welcome. Overall, we would happy to hear discussions on a broad range of topics such as: is it time now to look into modeling (kinematic or dynamic) the time-like variations of reference frames and their impact on datum realization unification and maintenance? What happened to the Astronomical (Natural) Coordinates in the era of GPS? How to maintain a datum when the major ones (World Geodetic System, ITRF and WGS84) keep changing? How important datum unification is for the man on the street? Are we happy with seven parameter transformations, can we do better with more parameters? In particular, we invite papers discussing datum problem specific to Western Pacific Region with emphasis on the status-quo, its impact on geodynamic studies and the future plans.

Conveners: Baki Iz, Hong Kong Polytechnic University; E-mail: lshbiz@polyu.edu.hk; Junyong Chen, National Bureau of Surveying and Mapping; E-mail: jychen@bepc2.ihep.ac.cn; Peter Morgan, University of Canberra; E-mail: peterm@ise.canberra.edu.au; Ming Yang, National Cheng Kung University; E-mail: myang@mail.ncku.edu.tw.

G05    Measuring Global Geodynamics and Mass Transports in Geophysical Fluids: Their Implication On Regional And Global Climate Change
Minute variations in the Earth's rotation and global gravitational field have been measured with increased accuracies in recent years. The measurements are made by means of space geodetic techniques including satellite laser ranging, very-long-baseline interferometry, the Global Positioning System, and satellite Doppler tracking. By the beginning of the next Millennium, dedicated gravity mapping satellite missions, such as CHAMP and GRACE, will provide unprecedented accurate measurements of the Earth's static gravity field and its time-varying gravity field components. These variations are caused by large-scale mass transport and redistributions that occur in the "geophysical fluids" on or within the Earth. These geophysical phenomena include atmospheric and hydrospheric circulations, tidal influences, continental hydrological variations, post-glacial rebound, earthquakes, and fluid core activities. This session solicits, but is not restricted to, papers dealing with advanced measurement techniques, especially those relevant to GRACE and CHAMP measurements, recent findings in space geodetic data analysis, geophysical interpretations, contemporary static and time-varying gravity field modeling, and modeling and computations for the geophysical fluid mass transport. Work relevant to global geophysical observations, such as ocean altimetry, and that dealing with dynamic couplings among the atmosphere-hydrosphere-solid Earth-core system, and their implications on the Western Pacific region are especially encouraged.

Conveners: Ben Chao, Goddard Space Flight Center; E-mail: chao@denali.gsfc.nasa.gov; Houtze Hsu, Wuhan Institute of Geodesy and Geophysics; Phone: +86-27-6783962; E-mail: zyz@asch.whigg.ac.cn; Byron Tapley, University of Texas Center for Space Research; E-mail: tapley@csr.utexas.edu; Tonie vanDam, NOAA/GRDL; E-mail: tonie@robeson.colorado.edu.

G06   Oceanographic And Geophysical Applications of Satellite Altimetry (Joint with OS)
The height of the sea surface of the global oceans has been observed by satellite radar altimeters continuously since 1991. This unique data record, consisting of data from ERS-1, -2 and TOPEX/POSEIDON Missions, has provided opportunities for studying a wide spectrum of scientific problems, ranging from ocean circulation to marine plate tectonics. By early 1998, U.S. Navy's GFO-1 mission is expected to add to the list of operating spaceborne altimeters. Papers from specific topics are solicited including planetary-scale waves, El Nino processes, oceanic boundary currents, coastal circulation, tides, surface waves, mean sea level variations, marine gravity and geoid, bathymetric features, lithospheric processes, etc. Significant progress has also been made in assimilation of altimetry data by numerical models for ocean circulation and climate studies. Results obtained from satellite altimetry in all aspects of geophysics are solicited for this special session. Satellite altimetry is also on the verge of becoming an operational observational system for navigational, climatic, and commercial applications. This session also invites paper to address the maturity of satellite altimetry as an operational system, its current and potential applications, and its relevance to the Western Pacific Region.

Conveners: Lee Fu, Jet Propulsion Laboratory; E-mail: llf@pacific.jpl.nasa.gov; Shiro Imawaki, Kyushu University; E-mail: imawaki@riam.kyushu-u.ac.jp; John Blaha, Naval Research Laboratory; E-mail: blaha@navo.hpc.mil; Pierre Bahurel, Service Hydrographique et Oceanographique de la Marine/Centre Militaire d'Oceanographie; E-mail: pierre.bahurel@cnes.fr.

G07    Atmospheric Limb Sounding with GPS/MET and Beyond (Joint with A)
The GPS/MET program was established in 1993 to demonstrate active limb sounding of the Earth's atmosphere using the radio occultation technique. The mission has been quite successful and GPS/MET data and products have been used by institutions worldwide for neutral atmospheric and ionospheric studies. Algorithms for data inversion have been developed independently by several groups and result comparisons are now being conducted. Techniques are under development to apply GPS/MET data to weather prediction, climate studies, space weather monitoring, and geodetic studies such as mapping of Earth's static and time-varying gravity field. As the GPS/MET proof-of-concept experiment is coming to an end, the data set can also be valuable for the design of those limb sounding missons that are planned to follow GPS/MET. This session discusses GPS/MET data analysis techniques, results, scientific application of GPS/MET data products on a global scale and regionally such as the Western Pacific, and planned future missions with emphasis on improvements over GPS/MET.

Conveners: Chris Rocken, UCAR; E-mail: rocken@unavco.ucar.edu; Lou Lee, Taiwan National Space Program Office; E-mail: loulee@nspo.gov.tw; Cheng Huang, Shanghai Observatory; E-mail: hc@center.shao.ac.cn; Paul Tregonning, Australian National University; E-mail: pault@rses.anu.edu.au.

G08    Advances in Space Geodetic Technologies for Regional and Global Crustal Motion Studies
Latest achievements in determining crustal motions by space-geodetic techniques, including SLR, DORIS, GPS, GLONASS, VLBI, and PRARE, will be highlighted in this session, along with the necessary recent improvement in precision orbit determination. This session is intended to concentrate on two themes. The first theme will focus on the determination of crustal motions in general, and for the Pacific area in particular, using different techniques, and on increases in the understanding of these motions. The second theme will address the question of how to combine, validate, and calibrate the different techniques in the studies of crustal motions, and discuss the relevance of the different techniques in this field, taking into account different spatial resolutions and time scales. Global and regional projects, such as the APSG and the GEODYSSEA projects and its use of these techniques are encouraged. Also included is a forum for presentations of the latest achievements in the field of orbit determination and to apply these techniques to exploit recent advancement in space geodetic techniques, including the following: precise orbit computation including modeling techniques (analytical and numerical methods); new scientific instrumentation for satellites including early results; requirements and novel orbit determination techniques for future satellites and proposed future gravity missions such as GOCE and GRACE; models for the description of the nonconservative forces acting on spacecraft such as LAGEOS I and II, TOPEX/Poseidon, ERS I and II, SPOT, GFO, GFZ, and the GPS constellation or other geodetic satellites; and other technical achievements.

Conveners: Pieter Visser, Delft Technical University; E-mail: Pieter.Visser@lr.tudelft.nl; Chi-Ching Liu, Institute of Earth Science; E-mail: liucc@sinica.edu.tw; John Bosworth, Goddard Space Flight Center; E-mail: jmb@ltpmail.gsfc.nasa.gov; Ramesh Govind, Australian Surveying and Land Information Group; E-mail: rameshgovind@auslig.gov.au

G09    International Astronomical/Geophysical Services
The purpose of this special session is to describe Astronomical/Geodetic/Geophysical International Services, including the following: BIPM (International Bureau of Weights and Measures) ICET (International Centre of Earth Tides) IERS (International Earth Rotation Service) IGB (International Gravimetric Bureau) IGeS (International Geoid Service) IGS (International GPS Service for Geodynamics) PSMSL (Permanent Service for the Mean Sea Level) Emphasis will be placed on the usefulness of these services and others for the Western Pacific region and the vicinity. A panel discussion will attempt to establish the requirements for such services and others for the region. Most presentations for this session will be invited.

Conveners: Ivan Mueller, Ohio State University; E-mail: mueller@mps.ohio-state.edu; Shuhua Ye, Shanghai Observatory; E-mail: ysh@center.shao.ac.cn.

G10    Tidal Modeling in the Marginal Seas of the Western Pacific (Joint with OS)
Significant advances have been achieved in the modeling of deep ocean tides, primarily because of the precise TOPEX/POSEIDON satellite altimeter measurements. By comparison, tides over shelves and coastal regions are still insufficiently determined, especially in the many marginal seas along the western rim of the Pacific. The presence of potentially large overtides and compound tides and the high wavenumber complexity in these areas require sophisticated approaches. Uncertain knowledge of bathymetry and the presence of small islands and reef structures further complicates hydrodynamic modeling. This special session solicits papers describing the current state-of-the-art in tidal modeling and its applications, including the effect of large tides on the low-frequency circulation. Papers are especially sought for coastal and shelf tide studies in the regions surrounding Indonesia and Australia, the Yellow Sea, and the China Seas.

Conveners: Richard Ray, Goddard Space Flight Center; E-mail: ray@nemo.gsfc.nasa.gov; Lance Bode, James Cook University; E-mail: Lance.Bode@jcu.edu.au; Yaozhong Zhu, Wuhan Institute of Geodesy and Geophysics; E-mail: zyz@asch.whigg.ac.cn.

Hydrology (H)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

H01   Interaction Between Groundwater and Surface Water/Sea Water
Surface water bodies, such as lakes and streams, often act as sinks, sources, and short circuits as well as boundary conditions for groundwater systems. Interaction between groundwater and seawater is an important hydrological process in the coastal area. This session will focus on physical, chemical, and biological aspects of interaction between groundwater and surface water or seawater. Abstracts are solicited that deal with use of tracers for groundwater-surface water interaction, groundwater discharge in the coastal zone, capture zones of lakes and streams, hydrogeochemistry in surface-subsurface water systems, subsurface hydrological modeling in wetland or estuary systems, and other related topics. Please remember to send abstracts to both AGU and the session convener(s).

Convener: Makoto Taniguchi, Department of Earth Sciences, Nara University of Education, Nara 630, Japan, Phone: +81-742-27-9202, Fax: +81-742-27-9291, E-mail: makoto@nara-edu.ac.jp

H02   Hydrological and Biogeochemical Processes in Forest Catchments
Fate and transport of water and biogeochemical constituents in the hydrosphere of the forest catchment is the theme of this special session. Abstracts are solicited that deal with studies of basic hydrological and biogeochemical processes in forest catchments in tropic and subtropic regions, which improve our understanding of changes in the hydrological and ecological systems and ability to manage forest environment and water resources. The focus also will be on methods and strategies for determining the soil moisture at the watershed and regional scales, and in particular the role of soil moisture in the representation of terrestrial processes linking hydrological and atmospheric models. Abstracts dealing with any one or a combination of these and related topics are invited for this special session. Please remember to send abstracts to both AGU and the session convener(s).

Convener: Nobu Ohte, Forest Hydrology Laboratory, Division of Environmental Science and Technology, School of Agriculture, Kyoto University, 606-01, Kyoto, Japan, Phone: +81-75-753-6093, Fax: +81-75-753-6088, E-mail: nobu@bluemoon.kais.kyoto-u.ac.jp

H03   Computational Methods in Watershed Hydrology
There has been much recent progress in the development and calibration of both lumped and distributed models of watershed behavior. In particular, considerable consideration is being given to the multivariate nature of watersheds, i.e., modeling of simultaneous hydrologic, chemical, and energy responses. Also related to this is the convergence between hydrologic models and land surface parameterization schemes (under development for coupling with atmospheric models). This session will explore a broad range of topics related to these developments, with special attention to computational issues such as (1) how artificial neural networks, global optimization methods (e.g., genetic algorithm, shuffled complex evolution, simulated annealing, etc.), and other new computational techniques, can be applied to watershed modeling and calibration, (2) how much model complexity is required, and (3) what computational procedures are necessary to ensure proper model calibration and meaningful evaluation of model performance (particularly when two or more models are being compared). Abstracts dealing with any one or a combination of these and related topics are invited for this special session. Please remember to send abstracts to both AGU and the session convener(s).

Conveners: Hoshin Gupta, Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, Phone: +1-520-621-9360, Fax: +1-520-626-2488, E-mail: hoshin@hwr.arizona.edu; and Qingyun Duan, GCIP NOAA Core Project, NWS/NOAA, 1325 East-West Highway, Silver Spring, MD 20910, Phone: +1-301-713-1018, Fax: +1-301-713-1051, E-mail: Qingyun.Duan@noaa.gov

H04   Issues on Hydrocarbon Spills
This session will focus on topics related to cost-effective technologies and the risk-based corrective action (RBCA) methodology for remediating hydrocarbon spills. Abstracts dealing with regulatory policies for hydrocarbon contamination, development and application of cost-effective hydrocarbon recovery technology, and innovative treatment methods are welcome. Abstract are solicited that deal with assessment of cleanup levels based on RBCA, and case studies of treatment of refinery tank bottom sludge. Abstracts dealing with any one or a combination of these and related topics are invited for this special session. Please remember to send abstracts to both AGU and the session convener(s).

Convener: Leon Chen, Trust Environmental Services, LLC, 2227 West Lindsey Street, Suite 1500, Norman, OK 73069, Phone: +1-405-360-2600, Fax: +1-405-360-4577, E-mail: trust@telepath.com

H05   Hydrogeology and Hydrochemistry in Modern Coastal Mixing Zones
Increasing groundwater withdrawal along populated coastal areas has led to the invasion of seawater into freshwater aquifers. Seawater intrusion often limits the usage of groundwater from coastal aquifers for agricultural, industrial, or domestic purposes. A better understanding of factors controlling and an accurate prediction of the movement of the freshwater/seawater interface and water-sediment interactions are the key to resolving the seawater intrusion problem. This special session aspires to provide a forum for (1) the demonstration of the usage of field investigation, geochemical analyses, and computer modeling to study saltwater intrusion and (2) discussion of the scientific needs and challenges in these areas. We invite contributions covering theoretical aspects and/or case studies that illustrate the use of existing hydrological and geochemical methods and point to areas where more effort should be focused are invited for this special session. Please remember to send abstracts to both AGU and the session convener(s).

Convener: Ming-Kuo Lee, Department of Geology, Auburn University, Auburn, AL 36849, Phone: +1-334-844-4898, Fax: +1-334-844-4486, E-mail: leeming@mail.auburn.edu

H06   Basin Hydrogeology Modeling: Theoretical Analysis and Application
Quantitative basin-modeling techniques can be used to investigate how hydrologic processes operate and interact in the subsurface, to understand how transport phenomena operate on basin scales, and to visualize how basins have evolved through geologic time. Goals might include providing insight into where and when petroleum accumulated in a basin, how ore deposits formed, or what factors influenced the migration of hazardous wastes in basin strata. Basin-modeling techniques have widespread application in petroleum and minerals exploration and in the problems of environmental protection. The purpose of this session is to discuss state-of-the-art concepts, methodologies, basin case study histories, and future research focuses related to basin hydrogeology. Abstracts dealing with any one or a combination of these and related topics are invited for this special session. Please remember to send abstracts to both AGU and the session convener(s).

Convener: Ming-Kuo Lee, Department of Geology, Auburn University, Auburn, AL 36849, Phone: +1-334-844-4898, Fax: +1-334-844-4486, E-mail: leeming@mail.auburn.edu

H07   Progress in the GEWEX/GCIP and GAME
There has been much recent progress in the research related to the GEWEX/GAME (Asia) and GEWEX/GAME (North America) programs. This session is devoted to the exchange of information of such progress. The following topics are especially welcome, but not limited to: (1) improving the model representation of physical processes in atmosphere dynamics and land surface hydrology; parameterization of subgrid heterogeneity in precipitation, soil moisture, and vegetation; (2) improving the measurement and data base development in the GCIP and GAME regions; (3) improving the analysis of precipitation (rainfall and snow) over a range of time and space scales; and (4) making the output of GCIP and GAME more relevant for water resource management.

Conveners: K. Musiake, Institute of Industrial Science, University of Tokyo, Ninato-ku, Tokyo 106, Japan; H. Sugiyama, Research Institute of Agricultural and Forest Engineering, University of Tsukuba, Tsukuba-Ibaraki, 305 Japan, Phone: +81-0298-53-4715, Fax: +81-0298-55-2203; S. Sorooshian, Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, Phone: +1-520-621-1661, Fax: +1-520-626-2488; E-mail: soroosh@hwr.arizona.edu; and X. Gao, Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, Phone: +1-520-621-1083, Fax: +1-520-626-2488; E-mail: gao@hwr.arizona.edu.

H08   The Downstream Impact of Dams - Mitigating the Effects
It is becoming obvious that serious environmental problems have developed in relation to many dams which have been in place for a long time. In some cases this has led to the recommissioning of the dams or to major reviews of the management of releases from the dams, as in the case of the Glen Canyon Dam. Despite this, many major dams are still being constructed or are planned along the Western Pacific, for example in northern Australia and in many Asian countries. This session will focus on the downstream environmental impacts of dams and on the lessons from the older dam stock that can be used to improve the performance of the new generation of dams. This session is organized in conjunction with the Interdisciplinary Group on Australian Studies, National Taiwan University, Taipei.

Conveners: Brian Finlayson, Centre for Environmental Applied Hydrology, The University of Melbourne, Parkville 3052, Victoria, Australia; E-mail: b.finlayson@geography.unimelb.edu.au.

Ocean Sciences (OS)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

OS01   Sea Ice-Ocean Interaction and Water Mass Formation
Most of the water that fills the abyssal ocean originates in polar and subpolar regions where deep water forms due to intense air-sea buoyancy flux. Brine rejection associated with freezing often plays an important role in such water mass transformation processes. For instance, the densest water formed in the North Pacific Ocean can be traced to polynyas on the northwestern shelves inside the Sea of Okhotsk. Brine rejection from seasonally formed sea ice within the Tatarskiy Strait contributes to bottom water formation within the Sea of Japan (East). This session is intended to provide a forum for presenting results from observations and from numerical and theoretical models of polar and subpolar oceans, including such topics as ocean-ice interaction, seasonal and interannual variations of sea ice, water mass formation processes, and polar climate changes.

Conveners: Jiayan Yang, Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543; Phone: +1-508-289-3297; Fax: +1-508-457-2181; E-mail: jyang@whoi.edu; and Motoyoshi Ikeda, Graduate School of Environmental Earth Science, Hokkaido University, N10 W5, Kita-ku, Sapporo, Hokkaido 060 Japan; Phone: +81-11-706-2360; Fax: +81-11-726-6234; E-mail: mikeda@eoas.hokudai.ac.jp

OS02   Spacebased Observations of Ocean Surface Winds
From September 15, 1996 to June 29, 1997, the NASA scatterometer (NSCAT) observed surface ocean wind vectors at 25-km resolution, covering approximately 80% of the world's ocean every data. A variety of studies based on these ocean surface winds have been performed, including studies of numerical weather prediction, atmospheric storms, monsoons, hydrologic balance, air-sea fluxes, wind-wave interaction, wind-driven ocean circulation, ocean upwelling, and biological productivity. Abstracts on any aspect of the scientific application of space-based measurements of ocean surface winds, including winds derived from microwave altimeters, microwave radiometers, and European scatterometers, are welcome.

Conveners: W. Timothy Liu, Jet Propulsion Laboratory, MS 300-323, Pasadena, CA 91109; Phone: +1-818-354-2394; Fax: +1-818-393-6720; E-mail: liu@pacific.jpl.nasa.gov; and Professor Jough-Tai Wang, Chairman, Department of Atmospheric Sciences Institute of Atmospheric Physics, National Central University, Chung-Li, Taiwan 320; Phone: +886-3-442-0270; Fax: +886-3-425-6841; E-mail: wangjt@rainbow.atm.ncu.edu.tw.

OS03   Marine Process Studies Using Satellite Ocean Color
The session will emphasize physical and biological oceanic process studies on all scales of temporal and spatial variability using data from OCTS, POLDER, MOS and SeaWiFS. Some studies on the calibration and validation of these satellite ocean color data will also be considered.

Conveners: Chuck McClain, Oceans and Ice Branch, Laboratory for Hydrospheric Processes, NASA Goddard Space Flight Center, Greenbelt, MD 20771; Phone: +1-301-286-5377; Fax: +1-301-286-1761; E-mail: chuck@ardbeg.gsfc.nasa.gov; and Joji Ishizaka, National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, Ibaraki, 305 Japan; Phone: +81-298-58-8379; Fax: +81-298-58-8357; E-mail: ishizaka@nire.go.jp.

OS04   El Niņo and Monsoons: Understanding, Prediction, Applications
This session will include diagnostic and modeling studies towards the understanding of the Asian Monsoons, their interannual variability and interactions with the El Niņo/Southern Oscillation (ENSO) phenomenon. Special discussion will include the studies of Asia Monsoon forecasts and their application in the several impacted sectors (e.g. agriculture, water resources, public health) of the societies within the region. The current El Niņo 1997-98 impacts in the region should offer some interesting case studies.

Conveners: Antonio Divino Moura, International Research Institute of Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY 10964; Phone: +1-914-365-8493; E-mail: amoura@iri.ldgo.columbia.edu; and Ming-Dean Cheng, Research Division, Central Weather Bureau, 64 Kung-Yuan Rd., Taipei, Taiwan, Phone: +886-2-349-1080, Fax: +886-2-349-1089, E-mail: dc@bingo.cwb.gov.tw.

OS05   Coastal Processes
The session will include internal waves, storm-induced swell, Kuroshio intrusion on the continental shelf, upwellings, and mesoscale eddies and fronts. The coastal monitoring of these oceanic processes and their related environmental applications by in situ observations and remote sensing are also emphasized.

Conveners: Antony Liu, Oceans and Ice Branch, Laboratory for Hydrospheric Processes, NASA Goddard Space Flight Center, Greenbelt, MD 20771; Phone: +1-301-286-8534; Fax: +1-301-286-1761; and Ming-Kuang Hsu, National Taiwan Ocean University; Phone: +886-2-462-2192 ext. 6313; E-mail: hsumk@ind.ntou.edu.tw.

OS06   Exploring Intraseasonal Variability of the Monsoon System During Northern Summer
Interannual variability of south Asian summer monsoon rains seems to be largely controlled by the number and intensity of events known as intraseasonal oscillations (ISOs), with a 10- to 30-day period, in which rain bands move poleward into both the northern and southern hemisphere from the eastern Indian Ocean. These oscillations appear to be responsible for periods of intense rainfall over south Asia and may account for a large proportion of the winter rainfall over Australia. Like the lower-frequency, eastward-moving Madden-Julian Oscillations, two-way air-sea coupling is thought to be important to the dynamics of ISOs. Interannual SST and/or soil moisture anomalies probably influence monsoon rain by perturbing ISO dynamics. A multiyear investigation called JASMINE (Joint Air-Sea Monsoon Interaction Experiment) has been proposed to examine the dynamics and thermodynamics of monsoon ISOs. JASMINE will use diagnostic and empirical studies based on existing data sets, numerical model studies, and dedicated field campaigns over a 2-year period to provide detailed observations in the tropical eastern Indian Ocean, which appears to be the focal area of the ISOs. This session will provide an early opportunity for interested scientists to meet and exchange ideas.

Conveners: J. Stuart Godfrey, CSIRO Division of Marine Research. GPO Box 1538. Hobart, TAS 7001, Australia; Phone: +61-3-62-325-210; Fax: +61-3-62-325-123; E-mail: godfrey@ml.csiro.au; and Peter J. Webster, Program in Atmospheric and Oceanic Sciences, Campus Box 311, University of Colorado, Boulder, CO 80309; Phone: 303-492-5882; Fax: 303-492-3524; E-mail: pjw@willywilly.colorado.edu.

OS07   Marginal Seas Circulation Dynamics
The western boundary region of the North Pacific is unique in that it is lined with a series of large marginal seas with a circulation closely tied to the Kuroshio. Studies of the marginal seas circulation are difficult because of the complex topography and vigorous flow variabilities on a wide range of timescales. Several national and international programs have carried out observational studies, and numerical models with high resolutions have been developed. This session invites papers on observations and modeling of marginal seas circulation, on comparison of observations and model results, and on the role of Asian marginal seas in the climate.

Conveners: Phil Hsueh, Department of Oceanography, Florida State University, Tallahassee, FL 32306-3048; Phone: +1-904-644-6704; Fax: +1-904-644-2581; E-mail: hsueh@re.ocean.fsu.edu.

OS08   Monsoon and Air-Sea Interaction (SCSMEX) (Joint with T)
Major subjects of the session include diagnostic studies, modeling, and observations of the physical processes in oceanic response to East Asian monsoon forcing and air-sea interaction in the South China Sea, and relationships with the adjacent oceans. In particular, observations and issues related to recent field experiments of SCSMEX are solicited.

Convener: W. S. Chuang, National Taiwan University, E-mail: chuang@ccms.ntu.edu.tw.

OS09   World Ocean Circulation Experiment (WOCE)
The seasonal to millennial variation of our climate is closely correlated with the temperature, properties and circulation fluctuations in the ocean. For better understanding and predicting the climatic variation, WMO and ICSU jointly sponsored the World Ocean Circulation Experiment (WOCE) to document the property distribution and circulation patterns of the world oceans from the surface to the bottom. The collected data in WOCE are fed into the general climatic models for verification of their predictions and for selection of oceanic parameters that are suitable for the long-term monitoring of climatic changes. The seasonal to millennial variation of our climate is closely correlated with the temperature, properties and circulation fluctuations in the ocean. For better understanding and predicting the climatic variation, WMO and ICSU jointly sponsored the World Ocean Circulation Experiment (WOCE) to document the property distribution and circulation patterns of the world oceans from the surface to the bottom. The collected data in WOCE are fed into the general climatic models for verification of their predictions and for selection of oceanic parameters that are suitable for the long-term monitoring of climatic changes. WPGM is an ideal forum for reporting the findings on the circulation of the world ocean (especially the western Pacific ocean), for comparing similarities of the western boundary currents, and for collectively interpreting the climatic implication of chemical and physical oceanographic phenomena.

Conveners: Cho-Teng Liu, Institute of Oceanography, National Taiwan University, #1, Sec. 4, Roosevelt Road, Taipei, POB 23-13, TAIWAN, 106 ROC; Phone: +886-2-2-362-0624; E-mail: ctliu@ccms.ntu.edu.tw.

OS10   Beiogeochemistry of the Marginal Seas (JGOFS/KEEP)
As one of the largest marginal seas in the world, the East China Sea plays an important role in the exchange of chemical materials between the Asian continent and the North Pacific Ocean. This session will be attributed to the carbon cycling and the accompanied biogeochemical fluxes in the marginal seas. Several international and national programs have been initiated in the past years. One of the Taiwanese programs, the Kuroshio Edge Exchange Processes (KEEP) has been recognized as a part of the JGOFS. Several multidisciplinary expeditions were carried out in the region off northeastern Taiwan, where the Kuroshio impinges onto the continental margin and provokes vigorous mass and property exchange. Fruitful results from the expeditions are emerging. Some findings and implications with the emphasis on the biogeochemical cycling processes will be presented.

Conveners: C. L. Wei, Institute of Oceanography, National Taiwan University, Taipei; Phone: +886-2-2-367-7134; E-mail: weic@ccms.ntu.edu.tw.

OS11   Paleoceanography of the Western Pacific Marginal Seas: Hioghlights From IMAGES III
IMAGES III cruise was taking place during May-June, 1997. The cruise took cores from the South China Sea, Sulu Sea, and the marginal seas to the north and south of Australia covering wide areas of low-latitudes of both hemispheres in the western Pacific. Participants included geoscientists from France, Indonesian, Australia, New Zealand, China and Taiwan. We plan to present our preliminary results of shore-based study of selected cores obtained in this cruise. The main thrusts will be paleoceanographic evolution of the various marginal seas in the low-latitudes of the western Pacific. We will discuss the various responses of these marginal seas to the changing east Asia monsoons, the western Pacific Warm Pool and sea-level changes during the late Quaternary. The session itself also will serve as the first post-cruise meeting of the expedition.

Conveners: Kuo-Yen Wei, Dept. of Geology, National Taiwan University, 245 Choushan Road, Taipei, Taiwan, ROC; Phone: +886-2-363-3514; Fax: +886-2-3636095.

OS12   Ocean Drilling Results (ODP)
Any recent ODP results are welcome to be presented in this session. Chinese Taipei ODP Consortium has participated in the ODP for a shared membership as the PacRim member (Australia/Canada/Taiwan/South Korea) on January 29, 1997. This is the first time that the ODP scientific results will be presented in Taiwan. Dr. Min-Pen Chen is the Coordinator of the Taiwan ODP.

Conveners: Min-Pen Chen, Institute of Oceanography, National Taiwan University, P. O. Box 23-13, Taipei, Taiwan, ROC; Phone: +886-2-3914442; Fax: +886-2-3925294, E-mail: minpen@ccms.ntu.edu.tw.

OS13   Nearshore Nonlinear Waves and Breaking Waves
Any original contributions, either from field measurements or theoretical/numerical modeling, of nonlinear dynamics and kinematics of surface gravity waves and/or their breaking processes/effects on small-scale air-sea interface phenomena in the shallow water areas of coastal and surf zones.

Conveners: Ming-Yang Su, Naval Research Laboratory, Stennis Space Center, MS 39529; Phone: +1-228-688-5241; Fax: +1-228-688-5997; E-mail: su@nrlssc.navy.mil.

Planetology (P)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

P01   Dust and Planetary Rings
Direct and indirect detections, theoretical modelings, and laboratory analogue experiments related to cosmic dust and planetary ring particles will be discussed in this one-day session. Potential topics cover dust collections in the Antartic region, zodiacal light observations and modeling, theoretical modelling of the optical and physical properties of cosmic dust, sources of cosmic dust, orbital evolution and electrodynamics of interplanetary and interstellear dust, analogue experiments and space weathering effects, spacecraft in-situ measurements and sample return missions.

Conveners: T. Mukai, Department of Earth and Planetary Science, Kobe University, Nada, Kobe 657, Japan; E-mail: mukai@kobe-u.ac.jp; I. Mann, Max-Planck-Institut fuer Aeronomie, D-37191 Katlenburg-Lindau, Germany; E-mail: mann@linmpi.mpg.de; and E. Gruen, Max-Planck-Institut fuer Kernphysik, D-69029 Heidelberg, Germany; E-mail: gruen@dusty.mpi-hd.mpg.de.

P02   Asteroids and Minor Bodies
There are growing interest in near-earth asteoids, because the observational data are rapidly increasing and some are selected as space mission targets. This one-day session will focus on the relationship between near-earth asteroids and other small bodies in the solar system (main-belt asteroids, comets, outer small bodies, meteorites, meteors, and dusts) . It includes observational data, theory on physical properties and dynamical- and collisional-evolution of near-earth asteroids. Topics on laboratory experiments ( impact, spectroscopy, etc.) related with near-earth asteroids are also included.

Conveners: A. Fujiwara, Institute of Space and Aeronautrical Sciences, 3-1-1, Yoshinodai, Sagamihara, Kanagawa, 229, Japan; E-mail: fujiwara@planeta.sci.isas.ac.jp; D. Tholen, Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, Hawaii 96822; E-mail: tholen@uhifa.ifa.hawaii.edu.

P03   Radio Observations of Solar System Objects
This one-day session will focus on new advances in the radio and microwave observations of comets and planetary objects. In addition to the most recent results on Comet Hale-Bopp, special attentions will also be given to the studies of surface properties and structures of asteroids, Mercury, and the Moon, the atmospheres of Mars, Venus and major planetary satellites like Titan, the synchrotron radiation of Jupiter and its time variations, and high-resolution observations of young stellar objects and protoplanetary system. Finally, a survey will be given to the future prospects of millimeter and sub-millimeter measurements of solar system objects and extra-solar systems.

Conveners: I. de Pater, Department of Astronomy, University of California, Berkeley, CA 94720; E-mail: imke@floris.berkeley.edu.

P04   Hubble Space Telescope Observations of Solar Systems
One major achievement in solar system research in the last decade came from the observations by the Hubble Space Telescope at unprecedented high spatial resolution and detection sensitivity. This one-day session will provide a forum for a systematic exposure of the many exciting results. The targeted audience will be the scientific community and general public in the western Pacific region. As a demonstration of the versatility of the Hubble Space Telescope, measurements and important scientific results ranging from the inner planets to the most distant planet, Pluto, will be discussed. The exciting observations of the protoplanetary systems in the Orion Molecular Cloud and the associated dynamical processes will also be reviewed.

Conveners: J. T. Clarke, Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109; E-mail: clarke@umich.edu.

P05   Auroral and Magnetospheric Processes of the Outer Planets
This two-day session will synthesize our current understanding of the processes that control auroral variability and magnetospheric dynamics in the magnetospheres of the outer planets. Taking advantage of the most recent measurements from the Galileo mission, an attempt will be made to construct a comprehensive picture of the energy transport and particle acceleration processes in the auroral zone and other regions of the Jovian magnetosphere. Ground-based and Earth-orbiting observations from X-ray, UV, IR to microwave wavelengths will be emphasized. Most recent work on theoretical modellings of the global MHD processes and satellite-magnetosphere interactions will be presented.

Conveners: C. T. Russell, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567; E-mail: ctrussell@igpp.ucla.edu; and R. Prange, Institut d'Astrophysique Spatiale, Bat 121, CNRS-Universite Paris XI, F-91405, Orsay Cedex, France; E-mail: prange@iaslab.ias.fr.

P06   Origins
This one-day meeting will provide a forum on issues ranging from solar nebula structure, atmospheric evolution to the search for life. Topics to be covered are: chemcial composition and electrodynamics of the solar nebula, the origin and inter-relation of meteorites, the accretion of the terrestrial planets and giant gaseous planets, formation of the Earth-Moon system, formation of Pluto and the Kuiper belt objects, the cometary and asteroidal impact effects on planetary evolution, the dynamical processes involved in the early atmospheres of protoplanets and exoplanets, the volatile inventory on Mars and its implications on prebiotic chemistry, the exobiological significances of Titan's atmosphere, the search for a global ocean and possible submarine life on Europa, a comparison of the life-forming processes on Earth and Mars.

Conveners: W.-H. Ip, Max-Planck-Institut fuer Aeronomie, D-37191 Katlenburg-Lindau, Germany; E-mail: ip@linax1.dnet.gwdg.de; and T. Lee, Institute for Astronomy and Astrophysics, Sinica Academia, Taipei, Taiwan; E-mail: typhoon@biaa3.biaa.sinica.edu.tw.

P07   Terrestrial Planets
This one-day session will emphasize theoretical and observational studies of extended atmospheres and exospheres of the inner planets. Special topics in new results from the Mars Pathfinder and the Mars Global Surveyor will be presented.

Conveners: R. Killeen, Southwest Research Institute, 6220 Culebra Rd., Post Office Drawer 28510, San Antonio, TX 78228-0510; E-mail: rosemary@whipple.space.swri.edu; and A.F. Nagy, Space Physics Research Lab, University of Michigan, Ann Arbor, MI 48109; E-mail: anagy@umich.edu.

Seismology (S)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

S01   Earthquake Prediction - Status and Prospect
When successful, earthquake prediction (EP) will be very useful to mankind. Data pertaining to EP such as changes in strain, water level and EM fields are continuously being collected and research into prediction strategies are being actively pursued. Such studies have raised fundamental questions about the nature of the earthquake source and the spatio-temporal distribution of regional seismicity. For this special session, we wish to call for papers that critically evaluate the measurements as well as methods for forecasting and which address fundamental issues regarding the physical basis for EP. By exchanging data and ideas we hope, in the long run, to find rational approaches to EP.

Conveners: Charles Sammis, Department of Geological Sciences, University of Southern California, Los Angeles, CA; Yong Chen, State Seismological Bureau; Fax: +86-10-6821-5973; E-mail: chenyong@sun. ihep.ac.cn.

S02   Deep Structures of Subduction Zones in the Western Pacific (Joint with T)
With the advent of powerful imaging methods, seismologists are able to map the detailed structures in and around the subduction zones. The Western Pacific zones vary widely in terms of the geometry and their associated tectonic environments. This session solicits papers on studies of any aspects of the deep structures of the subduction zones.

Conveners: Francis T. Wu, SUNY, Binghamton, Department of Geological Sciences, Binghamton, NY 13902-6000; Phone: +1-607-777-2512; Fax: +1-607-777-2288; E-mail: wu@sunquakes.geol.binghamton.edu.

S03   Continental Lithosphere and Tectonophysics (Joint with T)
See T01

Convener:

S04   Rates of Modern Deformation in Rapidly Convergent Zones (Joint with T)
See G01

Convener:

S05   Crustal and Mantle Structures of Asia
The crustal and mantle structures of continental Asia are highly complex. Their exploration forms the basis for understanding the long and rich tectonic history of the area. We solicit papers on the elastic and anelastic structures as well as the anisotropic characters of the continent.

Conveners: Rong Seng Zeng, Institute of Geophysics, State Seismological Bureau, Beijing, China; Phone: +86-10-6841-5370, Fax: +86-10-6841-5372; E-mail: zengrs@cdsndmc.css.gov; and W. Mooney, USGS, 345 Middlefield Road, MS 977; Menlo Park, CA 94025; Phone: +1-415-329-4764.

S06   Seismic Networks
In the western Pacific many countries are planning to enhance or establish new seismic networks. The recent advent of new digital seismic instrumentation, with wide-dynamic range and broader frequency responses, makes it now possible to design mobile or fixed seismic monitoring systems appropriate for use in hazard mitigation, and/or for research purposes. The new advances have blurred the distinction between "weak-motion" and "strong-motion" networks. Also, with real-time transmission of network data, the concept of early warning can now be tested. The foci of this special session are to discuss the accomplishments and problems of using existing networks, and the design of future networks and research that demands and can take advantage of new networks.

Conveners: Convener: Jer-Ming Chiu, CERI, The University of Memphis, Memphis, TN 38152, USA; E-mail: chiu@ceri.memphis.edu; Tzay-Chyn Shin, Central Weather Bureau, Taipei, Taiwan; Phone: +886-2-2349-1116; Fax: +886-2-2349-1178; E-mail: shin@Taiwan.cwb.gov.tw; and Yun-tai Chen, Institute of Geophysics, State Seismological Bureau, Beijing, China; Phone: +86-10-6841-5370; Fax: +86-10-6841-5372; E-mail: chenyt@cdsndmc.css.gov.

S07   Tomography/Seismic Wave Propagation
Different techniques have been employed in studying the velocity structures in the interior of the Earth. This special session aims partially at promoting the exchange of ideas between researchers who base their studies on travel-times and those who use waveform modeling for the laterally varying Earth structure. We encourage papers on the basic theory of rays/waves in inhomogeneous media and the interpretation and case studies of seismic waves in complicated media. Topics of the studies can range from the core to the crust. Papers on modeling techniques, observation, interpretation and modeling of seismic signals in laterally varying Earth structure are also welcome.

Conveners: Fu-Tian Liu, Institute of Geophysics, Chinese Academy of Sciences, Beijing, People's Republic of China; Fax: +86-(0)10-62031995; E-mail: ftliu@sdb.csdi.ac.cn; and Bor-Shouh Huang, Institute of Earth Sciences, Academia Sinica, P. O. Box 1-55, Nankang, Taipei, Taiwan; Fax: +886-2-27839871; E-mail: hwbs@earth.sinica.edu.tw.

S08   Seismotectonics of Western Pacific
The Western Pacific area is rich in varieties of active tectonic regimes, including convergence/subduction, collision, transpression, subduction polarity switching, decoupling, etc. For such regimes the use of seismicity to delineate the active volumes and perhaps their rheology, the earthquakes for mapping the kinematics, and seismic waves for mapping the structure are extremely powerful ways to elucidate the complex tectonic systems. The understanding of the deformation in these tectonic regimes can also be enhanced by combining seismic information with geodetic and other information. Thus in this special session we invite contributions dealing with the detailed mapping of lateral as well as depth variations in the deformation patterns of the tectonic regimes, aiming at providing key constraints for modeling them.

Conveners: Yih-hsiung Yeh, Institute of Earth Sciences, Academia Sinica, PO Box 1-55, Nankang, Taipei, Taiwan; Phone: +886-2-783-9910; E-mail: yehyh@earth.sinica.edu.tw; and Francis T. Wu, Department of Geological Sciences, State University of New York, Binghamton, NY, USA; Phone: +1-607-777-2512; Fax: +1-607-777-2288; E-mail: wu@sunquakes.geol.binghamton.edu.

S09   Active Fault and Paleoseismology
The Western Pacific Rim is characterized by recurring movements on major faults; the ensuing large earthquakes cause widespread casualty and damage to property in the region. Recent earthquakes have raised worldwide interest in studies of active faults and paleoseismology. Also, in regions where long historical records are available, earthquake activities in the past can be deciphered. This special session invites papers that deal with: (1) studies of active fault, (2) crustal deformation associated with earthquake activities such as modification of river valleys and displaced marine terraces, (3) studies of paleoearthquakes and their imprints such as paleo-liquefaction and paleo-tsunami deposits, (4) analysis of historical records on earthquakes in the past, and (5) new technologies applied to the studies of active fault and paleoseismology.

Conveners: Chao-Hsia Chen, Central Geological Survey, MOEA, ROC, PO Box 968, Taipei, Taiwan; Phone: +886-2-9429042, Fax: +886-2-9429291; and Yoshihiro Kinugasa, Geological Survey of Japan, 1-1-3 Higashi, Tsukuba, Ibaraki, 305 Japan, Phone: +81-298-54-3688; Fax: +81-298-54-3748; E-mail: king@gsj.go.jp; and Raymundo S. Punongbayan, Philippines Institute of Volcanology and Seismology, C.P. Garcia Av., U.P. Campus, Diliman, Quezon City, Philippines, Phone: +63-2-926-2611, Fax: +63-2-929-8366, E-mail: rsp@philonline.com.ph.

S10   Strong Ground Motion Studies
With the new emphasis on strong ground motion networks in several areas in the Western Pacific, there is now a fairly rich archive of digital and analog strong motion data. This session focuses on new research results on various aspects of strong ground motion studies. Topics on the instrumentation of strong-motion array or network, and strong-motion data acquisition, processing and analyses are also encouraged.

Conveners: Kojiro Irikura, Disaster Prevention Research Institute, Uji, Kyoto 611, Japan; Phone: +81-774-38-4060; E-mail: irikura@egmdpri01.dpri.kyoto-u.ac.jp; Li-Li Xie, Institute of Engineering Mechanics, State Seismological Bureau, 9 Xuefu Road, Harbin, 150080, China; Phone: +86-451-6661304; E-mail: llxie@sdb.csdi.ac.cn; Hung-Chie Chiu, Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, Taiwan; Phone: +886-2-27839901 ext. 315; Fax: +886-2-27839871; E-mail: chiu@earth.sinica.edu.tw.

S11   Near Surface Effects on Ground Motions
The aim of the session will be to understand the site effects on ground motions. Topics to be considered include topographic effects, basin effects, soft soil responses, and nonlinear soil responses on ground motions. Papers based on various methods, including theoretical modeling, laboratory studies and test site observations are welcome.

Conveners: Kazuyoshi Kudo, University of Tokyo, Earthquake Research Institute, 1-1-1 Yayoi Bunko-Ku, Tokyo 113, Japan; Fax: +81-3-5803-2697; E-mail: kudo@eri.u-tokyo.ac.jp; and Kuo-Liang Wen, Institute of Earth Sciences, Academia Sinica, P. O. Box 1-55, Nankang, Taipei, Taiwan 115, R.O.C.; Fax: +886-2-2788-0332; E-mail: wenkl@earth.sinica.edu.tw.

S12   Advances in Earthquakes Loss Estimation and Its Applications
This session is to highlight recent research and development as well as to explore avenues to overcome outstanding problems concerning collection of inventories and treatment of uncertainty so that earthquake loss estimation techniques can best serve those who use them. Papers that shed new light on the methodology and demonstrate the power of loss estimation by case histories are solicited. Recent earthquakes in urban areas, such as those affecting Northridge, California, and Kobe, Japan, highlight once again the importance of anticipating earthquake losses in urban areas. Estimating earthquake losses has a variety of applications, including emergency response, risk management, and hazard mitigation. The field of earthquake loss estimation is currently in an exciting stage of development. Advances in computer science and GIS technology provide powerful tools for loss estimation. They present unprecedented capability to compile, analyze, modify, and display extensive geographical databases concerning potential geological hazards, the environment, and the vulnerability of urban centers. Networking and the internet allow quick and easy access of loss estimation results by users. Improved data sets collected in recent earthquakes, such as Loma Prieta, Northridge, and Great Hanshin, have been useful in developing models to better assess the performance of structures of various types and the extent of economic losses, casualties, and other social impacts. Finally, collaboration among geologists, engineers, economists, social scientists, emergency planners, and other users of loss estimates have fostered multidisciplinary discussions leading to more realistic models of the interactions between different types of damage and loss.

Conveners: Yi-Ben Tsai, Institute of Geophysics, National Central University, Chung-Li, Taiwan 320; Phone: +886-03-422-7837; Fax: +886-03-422-2044; E-mail: ybtsai@geps.gep.ncu.edu.tw; and Riley M. Chung, National Institute of Standards and Technology, Earthquake Emergency Group, Gaithersburg, MD 20899; Phone: +1-301-975-6062; Fax: +1-301-869-6275, E-mail: riley.chung@nist.gov.

S13   Ocean Bottom Seismometer (OBS) and Onshore/Offshore Seismic Studies
OBS deployment alone and Onshore/offshore study combining OBS with land-based deployment recording airgun signals are powerful methods for obtaining the crustal structures beneath the oceans and continental margins. They are particularly useful in the Western Pacific area. In this special session we wish to solicit papers on the processing of onshore/offshore data, the resulting crustal structures and interpretation of the results. Also, since interest has been expressed by several groups in obtaining new instruments, a workshop will be held during the WPGM meeting to discuss the design criteria and the possibility of cooperation in building and using the next generation of OBS.

Conveners: Chengsung Wang, Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan; Phone: +886-2-462-2192 ext 6307; Fax: +886-2-462-5038; E-mail: wangcs@ntou66.ntou.edu.tw; Clive Collins, Australian Geological Survey Organisation, PO Box 378, Canberra, ACT 2601, Australia; Phone: +61-2-6249-9544; Fax: +61-2-6249-9972; E-mail: ccollins@agso.gov.au; and Yosio Nakamura, University of Texas at Austin, Institute for Geophysics, 4412 Spicewood Springs Road, Bldg. 600, Austin, TX 78759-8500; Phone: +1-512-471-0428; Fax: +1-512-471-8844; E-mail: yosio@utig.ig.utexas.edu; and Ruey-Chyuan Shih, Institute of Seismology, National Chung Cheng University, Chiayi, Taiwan; Phone: +886-5-272-0411; E-mail: seirock@eq.ccu.edu.tw.

S14   Environmental Seismology
The development of the portable high-frequency multichannel seismographs in recent years has enabled geophysicists to address the problems in the top 1000 m of the Earth in detail, thus enabling the seismologists to contribute to the mapping of active faults and other structures, the building site characterization, the mapping of aquifers and plumes, etc. We solicit papers on these topics and also on innovative techniques for data acquisition and analysis.

Conveners: Cheng-Ying Wang, Institute of Geophysics, National Central University, Chung-Li, Taiwan 320; Phone: +886-03-422-7837; Fax: +886-03-422-2044; E-mail: cywang@geps.gep.ncu.edu.tw.

S15   Exploration Geophysics
Exploration geophysics primarily concerning the application of geophysics to the outer portion of the Earth's crust addressing the problem of structural and economic geology will be addressed. This session invites applied and theoretical papers in seismic, gravity, magnetic and electrical methods. Papers in borehole geophysics, ground-penetrating radar and other relevant subjects are also welcomed. Particular emphasis is placed on the seismic prospecting for hydrocarbons.

Conveners: Chin-Cheng Hu, Exploration and Development Research Institute, Chinese Petroleum Corporation, Miaoli, Taiwan; E-mail: cchu@cpcedri.com.tw; and Yng-Jou (Joe) Hwang, Conoco Taiwan Exploration and Production B. V., Taipei, Taiwan; E-mail: y-joe.hwang@conoco.dupont.com.

Solar-Planetary Space Physics and Aeronomy (SP)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

SP01   Theory and Simulations: Space Plasmas
Processes in space plasmas, as in the region upstream of the bow shock, in the magnetosheath, and in the ionosphere and magnetosphere, are intrinsically complex, multiscale, nonlinear, sporadic and intermittent in nature. Mesoscale models are required for studying the detailed processes taking place in boundaries like the bow shock, the magnetopause, the auroral region, and the tail current sheet. Global MHD simulations can give information on the large-scale response of the magnetosphere to the solar wind. On the other hand, microscale (kinetic) numerical and analytical studies are required for instability mode analysis and wave-particle interactions. The processes on each of these spatial scales may be coupled, and they themselves may have again a variety of timescales. It is hoped that this session will bring together the many sides of such studies.

Conveners: Tom Chang, Massachusetts Institute of Technology, Center for Space Research, Room 37-261, Cambridge, MA 02139; Phone: +1-617-253-7523; E-mail: tsc@space.MIT.edu; Lou Lee, College of Sciences, National Cheng Kung University, Tainan, Taiwan; Phone: +886-6-237-8377; E-mail: loulee@plasma.et.ncku.edu.tw; and Manfred Scholer, Max Planck Institute of Extraterrestrial Physics, P.O. Box 1603, 85740 Garching, Germany; Phone: +49-89-32993821; E-mail: mbs@mpe-garching.mpg.de.

SP02   Low, Middle and High Latitude Ionospheric Irregularities
Ionospheric irregularities of small- to medium-scale sizes will be dealt with in this session. These include generation processes by plasma instabilities, by interaction of the neutral and ionized atmosphere and by coupling from neutral dynamic phenomena, such as gravity waves. Recent in-situ and ground-based observations by radio-wave probing will be treated, and modelling, simulation as well as theoretical developments will also be included. The session will comprise several invited talks covering advances in studies of irregularities in equatorial latitudes, mid-latitudes and the auroral and polar cap region with its coupling to the magnetosphere. Oral and poster papers are solicited.

Conveners: Juergen Roettger, Max-Planck-Institut fuer Aeronomie, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany; phone: +49-5556-979163; fax: +49-5556-979240; E-mail: roettger@linmpi.mpg.de; R. Heelis, University of Texas at Dallas, Richardson, TX 75083, USA; E-mail: heelis@utdallas.edu; F.S. Kuo, Institute for Space Science, National Central University, Chung Li, Taiwan, ROC; E-mail: fskuo@uranus.ss.ncu.edu.tw.

SP03   Radar Observations of the Earth's Atmosphere
Radars have proved to become essential ground-based tools for studies of the Earth's lower, middle and upper atmosphere. These are particularly performed by incoherent scatter and MST radars, as well as meteor and MF radars. This special session will deal with recent scientific advances resulting from the use of these radar systems and their combination with other techniques, such as active and passive optical methods, rockets and satellites. Theory, modelling and simulation will also be included. The session should concentrate on the neutral atmosphere, and the coupling with the ionosphere should be considered, too. New atmospheric radar system design and techniques will also be covered. Besides several invited review papers, contributed papers are solicited for ral and poster presentation.

Conveners: S. Y. Su, Institute for Space Science, National Central University, Chung Li, Taiwan, ROC; E-mail: t2700146@twncu865.ncu.edu.tw; Y. H. Chu, Institute for Space Science, National Central University, Chung Li, Taiwan, ROC; E-mail: T272665@twncu865.ncu.edu.tw; J. Roettger, Max-Planck-Institut fuer Aeronomie, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany; phone: +49-5556-979163; fax: +49-5556-979240; E-mail: roettger@linmpi.mpg.de.

SP04   Using Co-ordinated Measurements in Space and on the Ground to Understand the Magnetosphere and Ionosphere
Ground-based and space-borne instruments complement each other in an excellent way. With ground-based instruments it is often possible to separate temporal and spatial effects and obtain long time-series, while satellites give the in-situ information. It is important to combine both to understand solar-terrestrial relations. Ground-based techniques are also becoming increasingly refined. Recently Japan has joined EISCAT, SuperDARN now covers large parts of both the northern and southern polar regions, and important high-latitude measurements are carried out at several Antarctic stations. This session will concentrate on high-latitude ground-based measurements. Mid- and low latitudes are discussed in session SP02.

Conveners: I. Sandahl, Swedish Institute of Space Physics, Box 812, S-981 28 Kiruna, Sweden, Phone: +46-980-79084, Fax: +46-980-79050, E-mail: ingrid@irf.se; Brian Fraser, University of Newcastle, Department of Physics, Newcastle NSW 2308, Australia, Phone: +61-49-21-5440, Fax: +61-49-21-6907, E-mail: phbjf@cc.newcastle.edu.au; and R. Fujiis, STELab, Japan; E-mail: rfujii@stelab.nagoya-u.ac.jp.

SP05   Space Weather
This special session provides an international forum on scientific research and program development associated with space weather and its modeling and forecasting. Space weather and its impact on space and ground technology systems and human in space have drawn increasing attention in the recent years. Countries and regions in the western Pacific region have started developing their space weather programs. The scientific exploration and knowledge accumulated in the past decades have laid the foundation for such programs and provided them with building blocks. New generation of space- and ground-based monitoring systems is increasing its capability to provide real-time description of the conditions on the Sun; in interplanatary space; the magnetosphere and the ionosphere; and on the ground. Rapidly advancing computing and communication technologies are reducing the time from data collection, to model calculation and to space weather forecasting, and make it meaningful for nowcasting and forecasting. With the strong support and involvement of our scientific community, several prototype space weather nowcasting and forecasting models have emerged or are been constructing. The scientific soundness and validity and further physical understanding of these models are of greater interests to our scientific community. This special session will provide an opportunity for us to share our knowledge, experience, excitement, and frustration, to debate the issues that concern us; and to assess the progress we have made. The session will feature a suite of invited talks as well as contributions on briefings on space weather programs of each country/region, user's and forecaster's perspectives, backbone global models, upstream modeling and forecasts, boundary layer and cusp modeling and forecasts, ring current and energetic particle modeling and forecasts, storm and substorm modeling and forecasts, and ionosphere and upper atmosphere modeling and forecasts.

Conveners: Paul Song, Space Physics Research Laboratory, University of Michigan, 2455 Howard Street, Ann Arbor, MI 48109; Phone: +1-313-764-8327; Fax: +1-313-647-3083; E-mail: psong@umich.edu; Janet Luhmann, Space Sciences Lab, University of California, Berkeley, CA 94720; Phone: +1-510-642-2545; Fax: +1-510-643-8302; E-mail: jgluhman@sunspot.ssl.berkeley.edu; Atsuhiro Nishida, Institute of Space and Astronautical Science, Japan; Phone: +81-427-51-3911 ext. 2000; E-mail: nishida@gtl.isas.ac.jp; Robert L. Carovillano, NASA Headquarters, Washington, DC 20546; Phone: +1-202-358-0894; E-mail: robert.carovillano@hq.nasa.gov; and Jih-Kwin Chao, National Central University, Chung-Li, Taiwan; Phone: +866-3-422-7171 ext. 5765; E-mail: jkchao@jupiter.ss.ncu.edu.tw.

SP06   Sun in Transition From Minimum to Maximum
It has been recognized that solar activity occurs in approximate 11 year cycles. Recently, sunspots have been observed at high solar latitudes, thus announcing the onset of a new cycle (Cycle 23) phenomena. In the meantime, there are a number of spacecraft strategically located in a variety of orbits from near-Earth to the distant heliosphere. Measurements from these spacecraft and ground -based observations coupled with theoretical and modeling efforts will lead to a better understanding of how the Sun dramatically evolves from a quiet Sun to an active Sun and its effects on the heliosphere. We invite interested scientists to contribute to these discussions.

Conveners: S. T. Wu, Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899; Phone: +1-205-890-6413; Fax: +1-205-890-6382; E-mail: wus@cspar.uah.edu; Anthony T.Y. Lui, Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723; Phone: +1-301-953-5000 ext. 8407; Fax: +1-301-953-1093; E-mail: anthony_lui@jhuapl.edu; and T. Chiuch, Institute of Astronomy, National Central University, Chung-li, Taiwan, Phone: +886-3-425-4878, E-mail: chiueh@phyasp.phy.ncu.edu.tw.

SP15   Seismo Electromagnetics
Short-term earthquake prediction is a very important subject for disaster prevention, and recently the importance of the use of em (electric, magnetic and electromagnetic) field variations has been recognized as one of the most promising candidates for earthquake prediction. The observation items of seismo electromagnetic phenomena can be classified into four categories: (1) ground-based measurement (of em phenomena in DC, ULF, ELF/VLF.LF, higher frequency range field variations and emissions), (2) satellite observations (plasma electromagnetic and light emissions etc.), (3) sounding measurement (radio sounding of the atmosphere and ionosphere by means of radio waves (the use of VLF, LV transmitter signals, GPS ionospheric tomography etc.), and (4) remote sensing (sensing of the ground surface from space, e.g., IR, SAR, etc.). Any kinds of precursory signatures of earthquakes in the above categories are welcome, and observational facts and their theoretical modelings are acceptable. Additional observations (such as geochemical, geophysical etc.) are also welcome. In this session, we will evaluate the previous observational phenomena, collect novel significant new data, and discuss the physical underlying mechanisms. We hope that these studies would be useful for future short-term earthquake prediction.

Conveners: Marashi Hayakawa, Department of Electronic Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182 Japan; Fax: +81-424-89-5861; E-mail: hayakawa@aurora.ee.uec.ac.jp; Yi Ben Tsai, National Central University, Institute of Geophysics, Chung-Li, Taiwan; Phone: +886-3-4227151 ext. 5645; Fax: +886-3-4222044; E-mail: ybtsai@geps.gep.ncu.edu.tw; and W. Ip, MPAe; E-mail: ip@linmpi.mpae.gwdg.de.

SP16   Energetic Particle Dynamics in Magnetospheres
The processes by which thermal particles are accelerated to high energies are of great cosmic significance. Much of the view that we have of the distant universe comes from energetic particles. In the magnetosphere of outer planets such as Jupiter and Earth it is known that energetic particles constitute an important component of the overall plasma population. These particles carry much of the global energy of these systems, they help determine the large-scale currents and magnetic configurations, and they provide the means to generate auroral and atmospheric interactions. There are also more reports now of positive correlations between spacecraft anomaly and the enhancement of ambient energetic particle flux. We have now entered a new era with the availability of multiple satellites with newer and more advanced detectors. These give us the best opportunity ever to tackle the problem of the general energy transfer. This special session provides a forum to discuss this increasingly important topic: energetic particle dynamics. We seek contributions of observational as well as theoretical papers to this session.

Conveners: Xinlin Li, Laboratory for Atmospheric and Space Physics, University of Colorado, 1234 Innovation Drive, Boulder, CO 80303; Phone: +1-303-492-3514; E-mail: lix@kitron.colorado.edu.

SP17   ULF Waves and Their Kinetic Effects
This session will address the issues related to the origin, propagation, and excitation mechanism of ULF waves as well as their effects on the plasma transport and heating. In particular, the following areas will be covered: observations, thoery, and simulation of ULF wave phenomena; kinetic effects on low frequency phenomena; plasma transport and particle energization related to ULF phenomena; substorm related ULFwaves and instabilities.

Conveners: Frank C. Z. Cheng, PPPL, Princeton University; E-mail: fcheng@pppl.gov.

Tectonophysics (T)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

T01   Continental Lithosphere and Tectonophysics
Continental lithospheric structures and tectonophysics present some of the most challenging problems in geophysics. However, new data and imaging techniques, in E-M, seismology and others, allow us to map the 3-D complexities throughout the crust and the mantle. Recent proliferation of S-polarization studies provides additional measurement that will increase our knowledge concerning the tectonic processes under the continent. This session calls for papers on the recent studies of continents, especially in Asia, that provides further constraints on our understanding of continental tectonics.

Conveners: Walter Mooney, USGS, Menlo Park, CA; Phone: +1-650-329-4764; E-mail: mooney@andreas.wr.usgs.gov; XianKang Zhang, Research Center of Exploration Geophysics, SSB, 104 Wenhua Rd., Zheng-zhou 450003, Henan, China; Phone: +86-371-393-4362; Fax: +86-371-1341; E-mail: xkzhang@sdb.csdi.ac.cn.

T02   Neotectonics/Geomorphology of Young Collision Orogeny
See S09

Convener:

T03   Symposium of Taiwan Orogeny - What do We Know and Where do We Go From Here (Joint with S)
As a young and active arc-continent collision, the Taiwan orogeny has been the focus of intensive studies. New data from diverse fields now yield pertinent data for further advancement in the comprehensive understanding of the ongoing mountain building processes. In this session we solicit papers that critically examine existing models and propose new models that can readily be subjected to testing.

Conveners: Francis T. Wu, Department of Geological Sciences, SUNY, Binghamton, NY 13902; Phone: +1-607-777-2512; Fax: +1-607-777-2512; E-mail: wu@sunquakes.geol.binghamton.edu; Neil Lundberg, Florida State University, Department of Geology, Tallahassee, FL 32306; Phone: +1-904-644-3743; Fax: +1-904-644-4214; E-mail: lundberg@gly.fsu.edu.

T04   Collision and Mountain Building
The western Pacific is an area marked by active collision tectonics, from the arc-arc collisions in the Philippines, Japan and Kamchatka to continental collision and subduction in Papua New Guinea, Timor, Taiwan and Central Asia. All of these collisions have dramatically changed the structure of the Earth's lithosphere and resulted in some of the most significant topographic anomalies on Earth. This session invites contributions related to the tectonic analysis of collision belts and the geodynamic interpretations of mountain building processes. Specific questions include: (1) What is the 2- and 3-D lithospheric structure of the collision belts? (2) What are the dominant tectonic processes in the collision zone? (3) What supports the topography and how does the range form and grow? (4) How is the crust of a mountain range deformed at both deep and shallow structural levels? (5) What is the relation between the crustal deformation in the collision belt and past or present plate motions? We seek contributions addressing the fundamental issues of collision tectonics and welcome integrated studies of individual collision belts.

Conveners: Louis S. Teng, Department of Geology, National Taiwan University, 245 Choushan Road, Taipei, Taiwan, ROC, Phone: +886-2-2362-7210; Fax: +886-2-2363-6095; E-mail: teng@sun01.gl.ntu.edu.tw; and Timothy Byrne, Department of Geology and Geophysics, University of Connecticut, Storrs, CT 06269, USA; Phone: +1-860-486-1384; Fax: +1-860-486-1383; E-mail: byrne@geol.uconn.edu.

T05   Asian Continental Margin and MArginal Sea Structures: A Special Session in Recognition of the Contribution of Professor Thomas Hilde
Professor Hilde has carried out pioneering studies of nearly all East Asian Seas, around the Asian Continental Margin. He helped to initiate the Marine Geophysical Program in Taiwan 30 years ago. He assisted the Asian countries in developing earth science and resource under United Nations CCOP Program in Bangkok. He established the Geodynamics Symposia in Texas A&M University and remains active in the studies of Pacific and Asian tectonics. In recognition of Professor Hilde's contributions, we wish to gather together his friends, students and fellow scientists to share and integrate our knowledge of the Asian Margin, its Marginal Seas and Subduction Zones, for the advancement of our science and for the benefit of the world's population living in this geotectonic region.

Conveners: Chao-Shing Lee, Australian Geological Survey Organisation, presently at the Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Rd. Keelung 202, Taiwan; Phone: +886-2-462-2192 ext 6509; Fax: +886-2-462-5038; E-mail: leecs@ntou66.ntou.edu.tw; Kensaku Tamaki, Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan; Phone: +81-3-5351-6443; Fax: +81-3-5351-6445; E-mail: tamaki@ori.u-tokyo.ac.jp.

T06   Modeling Mountain Building and Accretionary Wedges
The West Pacific is an area largely of convergent tectonics. This special session is intended to be on the leading edge of research relating to all types of geodynamic modeling of convergent margins. The purpose of the session is to bring together the leading researchers working in this field, to present new results, to discuss what are the appropriate boundary conditions and what are the basic observations that modelers should take into account, and to exchange ideas as to the advantage of the different approaches.

Conveners: C. Y. Wang, Department of Geology and Geophysics, University of California, Berkeley, CA 94720; J.C. Sibuet, Ifremer Centre de Brest, B.P. 70, 29280 Plousane Cedex, France; Phone: +33-298224233; Fax: +33-298224549; E-mail: jcsibuet@ifremer.fr; and Jyr-Ching Hu, Institute of Earth Sciences, PO Box 1-55, Academia Sinica, Nankang, Taipei, Taiwan; Phone: +886-2-2783-9910 x410; Fax: +886-2-2783-9871; E-mail: jchu@earth.sinica.edu.tw.

T07   Mantle Convection, Depth of Subduction and the Source of Plumes
This session is aimed to host discussions on new development in the study of the structures and dynamics of the Earth's interior, with emphasis on the deep mantle and the core. Topics include, but are not restricted to, numerical simulation of convection and plume, images of the slabs and the seismic discontinuities, and the heterogeneity in the lowermost mantle. During the 1990s, the Western Pacific region has seen renovation and new establishment of seismological and geophysical observatories that allow deep probing into the Earth. Advances in our understanding of the deep Earth processes resulting from these regional data are therefore important to the foci of this session. Contributions dealing with new constraints on the inner core rotation and D" structures obtained from the western Pacific observatories are especially encouraged in this session.

Conveners: Ban-Yuan Kuo, Institute of Earth Sciences, Academia Sinica, PO Box 1-55, Nankang, Taipei, Taiwan; Phone: +886-2-783-9910; E-mail: byk@earth.sinica.edu.tw; Ken C. Creager, Geophysics Program, University of Washington, Seattle, WA 98195; Phone: +1-206-685-2803; E-mail: kcc@geophysics.washington.edu.

T08   Collision/Extrusion Tectonics in East Asia
East Asia consists of numerous continental blocks, which are surrounded by orogenic belts and suture zones with ages ranging from Precambrian to Cenozoic. There are wide-ranging tectonic models that interpret these orogenic belts/sutures as the results of arc-continent collisions, continent-continent collisions, or intercontinental deformations/extrusions related to continental collisions. There is also a range of sedimentary basins possibly related to continental breakups or plate aggregation/extrusion. This session is thus designed for people working in the region to present new data, as well as relevant interpretations to verify various tectonic models. We welcome papers from all disciplines. Topics of particular interest include: (1) crustal composition and possible origin of various continental fragments in East Asia; (2) the timing and nature of various tectonic events in the region, ranging from Precambrian to present; (3) basin analysis; and (4) kinematics of plate collisions/extrusions which led to the formation of East Asia.

Conveners: Ching-Hua Lo, Department of Geology, National Taiwan University, 245 Choushan Road, Taipei, 106, Taiwan; Phone: +886-2-23635880; Fax: +886-2-23636095; E-mail: loch@ccms.ntu.edu.tw; and Zhengxiang Li, Tectonics Special Research Centre, Department of Geology and Geophysics, University of Western Australia, Nedlands WA 6907, Australia; Phone: +61-8-9380-2652; Fax: +61-8-9380-1037; E-mail: twzli@mail.geol.uwa.edu.au.

T09   Paleomagnetism: Contribution to Tectonics of East Asia and Western Pacific
This session welcomes papers on the use of paleomagnetism to unravel the history of Cenozoic collision tectonics in the Western Pacific, and East Asia in particular. One of the foci of this session is the reconstruction of paleo-continents in East Asia and the Western Pacific.

Conveners: Teh-Quei Lee, Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, 11529, Taiwan; Phone: +886-2-2783-9910 x426; Fax: +886-2-2783-9871; E-mail: tqlee@earth.sinica.edu.tw; and Yo-ichiro Otofuji, Department of Earth and Planetary Sciences, Kobe University, Nada 657, Kobe, Japan; Phone: +81-78-803-0564; Fax: +81-78-803-0490; E-mail: otofuji@kobe-u.ac.jp.

T10   Environmental Magnetism
The world PEP II transect (under PAGES) is located in the Western Pacific and East Asia. The magnetic methods are powerful tools for such studies. This session welcomes papers that apply magnetic methods to study lakes, marine sediments, loess, paleo-soils etc., with the aim of understanding paleo-climate and environmental changes.

Conveners: Teh-Quei Lee, Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, 11529, Taiwan, ROC; Phone: +886-2-27839910 ext 426; Fax: +886-2-27839871; E-mail: tqlee@earth. sinica.edu.tw; M. Hyodo, Department of Earth and Planetary Sciences, Kobe University, Nada 657, Kobe, Japan; E-mail: mhyodo@kobe-u.ac.jp, and T. Yamazaki; E-mail: yamazaki@gsj.go.jp.

T11   Multidisciplinary Studies of the Nankai and Cascadia Subduction Zones
The Nankai subduction zone in southwest Japan and the Cascadia subduction zone in western North America have many similarities, including geometry, slab age, convergence rate and obliquity, sediment supply, and stress and strain regimes. Comparative studies of the two regions can help us understand the fundamental geodynamic processes responsible for these similarities, and for the major differences in earthquake and volcanic history. This special session will provide an opportunity for people working on Nankai or Cascadia to share recent findings and ideas and will bring together geophysicists and geologists to examine the two subduction zones from an integrated, multidisciplinary perspective. Contributions dealing with convergent margin structure, earthquake processes and history, neotectonics, crustal deformation, arc processes, and tsunami studies for either subduction zone are welcome.

Conveners: A. Taira, University of Tokyo; E-mail: ataira@ori.u-tokyo.ac.jp; K. Wang, Geological Survey of Canada; E-mail: wang@pgc.emr.ca; and R. Wells, U.S. Geological Survey; E-mail: rwells@usgs.gov.

Volcanology, Geochemistry,Petrology (V)
If you are submitting an abstract to a special session, you must also send a copy of your abstract to the primary special session convener (first listed or marked with a *). Sending a copy of your abstract to a convener, however, does not constitute sending it to AGU. Abstracts MUST be received at AGU headquarters by March 23, 1998 (express/postal mail or e-mail submissions) or April 1, 1998 (Interactive Web Form Submissions).

V01   Island Arcs and Back Arc Basins in the Western Pacific
The western Pacific is always a fascinating place for the study of island arcs and back arc basins. Most of the active arc systems on Earth are located in this region. A better understanding of how subduction initiates the island arcs and how back arc rifting to form the marginal basins, is fundamental for revealing the convergent processes and regional geologic history. This session will focus on what we have learned about the arc and back arc basin configurations from this region, what questions remain unanswered, and what directions future cooperative research will take.

Conveners: Tung-Yi (Tony) Lee, Department of Earth Sciences, National Taiwan Normal University, 88, Sec. 4 Ting-Chou Road, Taipei 117, Taiwan, Phone: +886-2-2934-7120, E-mail: t44001@cc.ntnu.edu.tw; and Gaku Kimura, Geological Institute, University of Tokyo, Hongo 7-3-1, Bukyo, Tokyo 113, Japan, Phone: +81-3-3812-2111, E-mail: gaku@geol.s.u-tokyo.ac.jp.

V02   Western Pacific Lithosphere Evolution and Magmatism: From Eastern Eurasia to Australia
Given that the region provides an excellent natural laboratory to study the evolution of several types of mantle lithosphere and magmatism relating to diverse tectonic settings, this session encourages multidisciplinary contributions from fields including petrology, geochemistry, geodynamics, and geophysics. It will not only focus on continental domains, but also on marginal basins in the western Pacific. Whereas presentations that explore the systematic differences of the lithospheric mantle in time and space in certain areas may be organized, reports and reviews of specific or general tectonomagmatic processes regarding mantle dynamics and magma generation in the region are all welcome.

Conveners: Sun-Lin Chung, Department of Geology, National Taiwan University, 245 Choushan Road, Taipei 106-17, Taiwan; Phone: +886-2-363-0231 ext. 2674; Fax: +886-2-363-6095; E-mail: sunlin@ccms.ntu.edu.tw; Suzanne Y. O'Reilly and William L. Griffin, Key Centre for the Geochemical Evolution and Metallogeny of Continents, School of Earth Sciences, Macquarie University, Sydney 2109, Australia; Phone: +61-2-9850-8362; Fax: +61-2-9850-8943; E-mail: sue.oreilly@mq.edu.au and bill.griffin@mq.edu.au.

V03   Magma Generation, Intrusion and Eruption
This session welcomes submissions that discuss the magma generation of extrusive and intrusive rocks along the western Pacific " Ring of Fire." Topics of interest shall include geochemical and isotopic characteristics of volcanic and plutonic rocks from subductions, back arc basins and continental margins. Knowledge of the eruption properties and mechanisms of active volcanoes is also encouraged to present in this session. The problem of magma variations with time during eruption of an active volcano is specially emphasized.

Conveners: Chang-Hwa Chen, Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Taipei, Taiwan; Phone: +886-2-783-9910 ext.615; Fax: +886-2-783-9871; E-Mail: china@earth.sinica.edu.tw; C. P. Wood, Institute of Geological and Nuclear Sciences Ltd., Wairakei Research Center, Taupo, New Zealand; Phone: +64-7-374-8211; Fax: +64-7-374-8199; E-Mail: CP.Wood@gns.cri.nz; and P. R. Castillo, Scripps Institution of Oceanography, La Jolla, CA; Phone: +1-619-534-0383; E-Mail: pcastillo@ucsd.edu.

V04   Reactivation Potential of Long-Dormant Volcanoes
Long-dormant volcanoes occasionally awaken, to the surprise and chagrin of nearby communities (e.g., Montserrat, Pinatubo). Repose periods can be 10E3 to 10E4 years, or even 10E5 or 10E6 years for especially large volcanic systems. Sometimes, volcanologists are asked to assess the probability that a long-dormant volcano will reawaken within a specified planning timeframe. Contributions are solicited that propose a variety of methods for such assessments -- statistical, geologic, geophysical, and geochemical. Papers should relate observations, methods, and assessments to understanding of magmatic, hydrothermal, and tectonic processes. A 1-day field trip to the long-dormant Tatun volcanoes may be arranged for up to 20 participants. Contact the conveners if interested.

Conveners: Frank Yang, Department of Geology, National Taiwan University, 245 Choushan Road, Taipei 106-17, Taiwan; Phone: +886-2-369-5568; E-mail: tyyang@ccms.ntu.edu.tw; and Chris Newhall, U.S. Geological Survey, Department of Geological Sciences, University of Washington, Box 351310, Seattle, WA 98195; Phone +1-206-616-1933; E-mail: cnewhall@geophys.washington.edu.

V05   Collision/Extrusion Tectonics in East Asia (Joint with T)
East Asia consists of numerous continental blocks, which are surrounded by orogenic belts and suture zones with ages ranging from Precambrian to cenozoic. There are wide-ranging tectonic models which interpret these orogenic belts/sutures as the results of either arc-continent collisions, continent-continent collisions, or inter-continental deformations/extrusions related to continental collisions. There is also a range of sedimentary basins possibly related to continental breakups or plate aggregation/extrusion. This session is thus designed for people working in the region to present new data, as well as relevant interpretations to verify various tectonic models. We welcome papers from all disciplines. Topics of particular interest include: (1) crustal composition and possible origin of various continental fragments in East Asia; (2) the timing and nature of various tectonic events in the region, ranging from Precambrian to present; (3) basin analysis; and (4) kinematics of plate collisions/extrusions which led to the formation of East Asia.

Conveners: Ching-Hua Lo, Department of Geology, National Taiwan University, 245 Choushan Road, Taipei, 106, Taiwan; Phone: +886-2-3635880; Fax: +886-2-3636095; E-mail: loch@ccms.ntu.edu.tw; Zhengxiang Li, Tectonics Special Research Centre, Department of Geology and Geophysics, University of Western Australia, Nedlands WA 6907, Australia; Phone: +61-8-9380-2652; Fax: +61-8-9380-1037; E-mail: twzli@mail.geol.uwa.edu.au.

V06   Ultrahigh-Pressure Belts and Mantle-Crust Interactions
The discovery of ultrahigh-pressure metamorphic rocks testifies that rocks from the Earth's surface survived from a round trip to the upper mantle depth. These ultrahigh-pressure rocks are ground truth for testing hypotheses of continental collision and may record all the processes that have occurred during the pathways. While mineralogical, geochemical, and rheological changes are evident, the possible (fluid) interactions between mantle and crustal rocks during ultrahigh-pressure metamorpism are most intriguing. The studies of the ultrahigh-pressure belts around the world may not only provide better understanding about the tectonic histories but also offer revealing comparisons between collision and subduction tectonics. Contributions that incorporate new data, interpretations, and geodynamic model simulations on ultrahigh-pressure rocks are all welcome.

Conveners: Tzen-Fu Yui, Institute of Earth Science, Academia Sinica, Taipei, Taiwan; Phone: +886-2-783-9910; E-mail: tfyui@earth.sinica.edu.tw; and J.G. Liou, Department of Geology and Environment Sciences, Stanford University, Stanford, CA 94305; Phone: +1-415-723-2716; E-mail: liou@pangea.stanford.edu.

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