References

1

Aki, K., Scattering conversions P to S versus S to P, Bull. Seism. Soc. Am., 82, 1969--1972, 1992.

2

Chen, H.-W., and G. A. McMechan, 3-D physical modeling and pseudospectral simulation of seismic common-source data volumes, Geophys., 58, 121--133, 1993.

3

Chen, X., A systematic and efficient method of computing normal modes for multilayered half-space, Geophys. J. Int., 115, 391--409, 1993.

4

Clarke, T. J., The complete ordered ray expansion - I. Calculation of synthetic seismograms, Geophys. J. Int., 115, 421--434, 1993a.

5

Clarke, T. J., The complete ordered ray expansion - II. Multiphase body wave tomography, Geophys. J. Int., 115, 435--444, 1993b.

6

Coultrip, R. L., High-accuracy wavefront tracing travel time calculation, Geophys., 58, 284--292, 1993.

7

Ellefsen, K. J., C. H. Cheng and M. N. Toksoz, Applications of perturbation theory to acoustic logging, J. Geophys. Res., 96, 537--549, 1991a.

8

Ellefsen, K. J., C. H. Cheng and M. N. Toksoz, Effects of anisotropy upon the normal modes in a borehole, J. Acoust. Soc. Am., 89, 2597--2616, 1991b.

9

Ellsworth, W. L., D. Eberhart-Phillips and E. Kissling, A test of local earthquake tomography (abstract), Seism. Res. Lett., 62, 31-32, 1991.

10

Field, E., and K. Jacob, The theoretical response of sedimentary layers to ambient seismic noise, Geophys. Res. Letts., 20, 2925--2928, 1993.

11

Fischer, R., and J. M. Lees, Shortest path ray tracing with sparse graphs, Geophysics, 58, 987--996, 1993.

12

Fisk, M. D., E. E. Charrette and G. D. McCartor, A comparison of phase screen and finite difference calculations for elastic waves in random media, J. Geophys. Res., 97, 12409--12424, 1992.

13

Fisk, M. D., and G. D. McCartor, The phase screen method for vector elastic waves, J. Geophys. Res., 96, 5985--6010, 1991.

14

Frankel, A., Three-dimensional simulations of ground motion in the San Bernadino Valley, California, for hypothetical earthquakes on the San Andreas Fault, Bull. Seism. Soc. Am., 83, 1020--1041, 1993.

15

Frankel, A., and W. Leith, Evaluation of topographic effects on P and S waves of explosions at the northern Novaya Zemlya test site using 3-D numerical simulations, Geophys. Res. Letts., 19, 1887--1890, 1992.

16

Frankel, A., and J. Vidale, A three-dimensional simulation of seismic waves in the Santa Clara Valley, California, from a Loma Prieta aftershock, Bull. Seism. Soc. Am., 82, 2045--2074, 1992.

17

Gee, L. S., and T. J. Jordan, Generalized seismological data functionals, Geophys. J. Int., 111, 363--390, 1992.

18

Gibson, R. L., M. N. Toksoz and F. Batini, Ray-Born modelling of fracture-zone reflections in the Larderello geothermal field, Geophys. J. Int., 114, 81--90, 1993.

19

Gibson, R. L., and M. Campillo, Numerical simulation of high- and low-frequency -wave propagation, Geophys. J. Int., 118, 47--56, 1994.

20

Gilbert, F., Splitting of the free-oscillation multiplets by steady flow, Geophys. J. Int., 116, 227--229, 1994.

21

Graves, R. W., Modeling three-dimensional site response effects in the Marina District Basin, San Francisco, California, Bull. Seism. Soc. Am., 83, 1042--1063, 1993.

22

Guest, W. S., C. J. Thomson and C. P. Spencer, Anisotropic reflection and transmission calculations with application to a crustal seismic survey from the East Greenland shelf, J. Geophys. Res., 98, 14161--14184, 1993.

23

Hansen, R. A., F. Ringdal and P. G. Richards, The stability of RMS measurements and their potential for accurate estimation of the yields of Soviet underground nuclear explosions, Bull. Seism. Soc. Am., 80, 2106--2126, 1990.

24

Its, E. N., and J. S. Lee, Reflection and transmission of surface waves at a vertical interface in anisotropic elastic media, Bull. Seism. Soc. Am., 83, 1355--1372, 1993.

25

Kanamori, H., W phase, Geophys. Res. Letts., 20, 1691--1694, 1993.

26

Kendall, J.-M., and C. J. Thomson, Seismic modelling of subduction zones with inhomogeneity and anisotropy - I: Teleseismic P-wavefront tracking, Geophys. J. Int., 112, 39--66, 1993.

27

Lees, J. M., The magma system of Mount St. Helens: Nonlinear high-resolution P-wave tomography, J. Volc. Geoth. Res., 53, 103--116, 1992.

28

Lees, J. M., and E. Shalev, On the stability of P-wave tomography at Loma Prieta: A comparison of parameterizations, linear and nonlinear inversions, Bull. Seism. Soc. Am., 82, 1821--1839, 1992.

29

Levander, A. R., and B. S. Gibson, Wide-angle seismic reflections from two-dimensional random target zones, J. Geophys. Res., 96, 10251--10260, 1991.

30

Levander, A. R., and K. Hollinger, Small-scale heterogeneity and large-scale velocity structure of the continental crust, J. Geophys. Res., 97, 8797--8804, 1992.

31

Li, X.-D., and T. Tanimoto, Waveforms of long-period body waves in a slightly aspherical Earth model, Geophys. J. Int., 112, 92--102, 1993.

32

Liu, Y.-B., and R.-S. Wu, A comparison between phase screen, finite difference, and eigenfunction expansion calculations for scalar wves in inhomogeneous media, Bull. Seism. Soc. Am., 84, 1154--1168, 1994.

33

McLaughlin, K. L., T. G. Barker, S. M. Day, B. Shkoller and J. L. Stevens, Effects of subduction zone structure on explosion-generated Rayleigh waves: 3-D numerical simulations, Geophys. J. Int., 111, 291--308, 1992.

34

Moser, T. J., Shortest path calculation of seismic rays, Geophys., 56, 59--67, 1991.

35

Murakami, H., Surface wave propagation in a half-space with a single set of regular joints, J. Geophys. Res., 96, 4173--4186, 1991.

36

Nihei, K. T., L. R. Meyer, N. G. W. Cook and W. Yi, Effects of non-welded interfaces on guided SH-waves, Geophys. Res. Letts., 21, 745--748, 1994.

37

Nolte, B., L. N. Frazer and S. Mallick, Seismogram synthesis for azimuthally anisotropic media with a single slowness integration, Geophys. J. Int., 111, 127--140, 1992.

38

Nowack, R. L., Wavefronts and solutions of the eikonal equation, Geophys. J. Int., 110, 55--62, 1992.

39

Park, J., The sensitivity of seismic free oscillations to upper mantle anisotropy I. Zonal structure, J. Geophys. Res., 98, 19933--19949, 1993.

40

Park, J., and Y. Yu, Anisotropy and coupled free oscillations: Simplified models and surface wave observations, Geophys. J. Int., 110, 401-420, 1992.

41

Pollitz, F. F., Propagation of surface waves on a laterally heterogeneous earth: Asymptotics of the two-dimensional wave equation, Geophys. J. Int., 111, 67--78, 1992.

42

Qin, F., and G. T. Schuster, First arrival traveltime calculation for anisotropic media, Geophys., 58, 1349--1358, 1993.

43

Qu, J., T.-L. Teng and J. Wang, Modeling of short-period surface wave propagation in Southern California, Bull. Seism. Soc. Am., 84, 596--612, 1994.

44

Randall, G. E., Efficient calculation of complete differential seismograms for laterally homogeneous earth models, Geophys. J. Int., 118, 245--254, 1994.

45

Resovsky, J. S., and M. H. Ritzwoller, Characterizing long-period seismic effects of long-wavelength elastic and anelastic models, Geophys. J. Int., 117, 365--393, 1994.

46

Rial, J. A., and H. Ling, Theoretical estimation of the eigenfrequencies of 2-D resonant sedimentary basins: Numerical computations and analytic approximations to the elastic problem, Bull. Seism. Soc. Am., 82, 2350--2367, 1992.

47

Richards, P. G., D. C. Witte and G. Ekstrom, Generalized ray theory for waves in structures with planar nonparallel interfaces, Bull. Seism. Soc. Am., 81, 1309--1331, 1991.

48

Ritzwoller, M. H., and E. M. Lavely, Long-period surface waves and mantle boundary undulations, Geophys. J. Int., 116, 205--216, 1994.

49

Saikia, C. K., Estimated ground motions in Los Angeles due to earthquake on the Elysian thrust fault, Bull. Seism. Soc. Am., 83, 780--810, 1993.

50

Saikia, C. K., Modified frequency-wavenumber algorithm for regional seismograms using Filon's quadrature: Modelling of waves in eastern North America, Geophys. J. Int., 118, 142--158, 1994.

51

Schneider, W. A., K. A. Ranzinger, A. H. Balch and C. Kruse, A dynamic programming approach to first arrival traveltime computation in media with arbitrarily distributed velocities, Geophys., 57, 39--50, 1992.

52

Scott, J. S., Microearthquake Studies in the Anza Seismic Gap, Ph.D. Thesis, University of California at San Diego, La Jolla, California, 1992.

53

Scott, J. S., T. G. Masters, and F. L. Vernon, 3-D velocity structure of the San Jacinto fault zone near Anza, California -- I. P waves, Geophys. J. Int., 119, 611--626, 1994.

54

Sen, M., and L. N. Frazer, Multifold phase path integral synthetic seismograms, Geophys. J. Int., 104, 479--488, 1991.

55

Sinha, B. K., A. N. Norris, and S.-K. Chang, Borehole flexural modes in anisotropic formations, Geophys., 59, 1037--1052, 1994.

56

Stevens, J. L., K. L. McLaughlin, B. Shkoller and S. M. Day, 2-D axisymmetric calculations of surface waves generated by an explosion in an island, mountain and sedimentary basin, Geophys. J. Int., 114, 548--560, 1993.

57

Su, L., Park, J., and Y. Yu, Born seismograms using coupled free oscillations: the effects of strong coupling and anisotropy, Geophys. J. Int., 115, 849--862, 1993.

58

Thomson, C. J., J.-M. Kendall and W. S. Guest, Geometrical theory of shear-wave splitting: corrections to ray theory for interference in isotropic/anisotropic transitions, Geophys. J. Int., 108, 339--363, 1992.

59

Tromp, J., Surface wave propagation on a rotating anisotropic earth, Geophys. J. Int., 117, 141--152, 1994.

60

Tromp, J., and F. A. Dahlen, Variational principles for surface wave propagation on a laterally heterogenous Earth - I. Time-domain JWKB theory, Geophys. J. Int., 109, 581--598, 1992a.

61

Tromp, J., and F. A. Dahlen, Variational principles for surface wave propagation on a laterally heterogenous Earth - II. Frequency-domain JWKB theory, Geophys. J. Int., 109, 599--619, 1992b.

62

Tromp, J., and F. A. Dahlen, Surface wave propagation in a slowly varying anisotropic waveguide, Geophys. J. Int., 113, 239--249, 1993a.

63

Tromp, J., and F. A. Dahlen, Variational principles for surface wave propagation on a laterally heterogenous Earth - III. Potential representation, Geophys. J. Int., 112, 195--209, 1993b.

64

Um, J., and F. A. Dahlen, Normal mode multiplet coupling on an aspherical, anelastic earth, Geophys. J. Int., 111, 11--31, 1992.

65

Um, J., and C. H. Thurber, A fast algorithm for two-point ray tracing, Bull. Seism. Soc. Am., 77, 972--986, 1987.

66

VanDecar, J. C., Upper Mantle Structure of the Cascadia Subduction Zone from Non-Linear Teleseismic Travel-Time Inversion, Ph.D. Thesis, University of Washington, Seattle, Wash., 1991.

67

van Trier, J., and W. W. Symes, Upwind finite-difference calculation of traveltimes, Geophys., 56, 812--821, 1991.

68

Vidale, J. E., Finite difference calculation of traveltimes, Bull. Seism. Soc. Am., 78, 2062--2076, 1988.

69

Vidale, J. E., Finite difference calculation of traveltimes in three dimensions, Geophys., 55, 521--526, 1990.

70

Wagner, G. S., and C. A. Langston, A numerical investigation of scattering effects for teleseismic plane wave propagation in a heterogeneous layer over a homogeneous half-space, Geophys. J. Int., 110, 486-500, 1992.

71

Wang, Z., F. A. Dahlen and J. Tromp, Surface wave caustics, Geophys. J. Int., 114, 311--324, 1993.

72

Wang, Z., and F. A. Dahlen, JWKB surface wave seismograms in a laterally heterogeneous earth, Geophys. J. Int., 119, 381--401, 1994.

73

Witte, D. C., and P. G. Richards, The pseudospectral method for simulating wave propagation, Comp. Acoustics, 3, 1--18, 1990.

74

Woodhouse, J. H., and F. A. Dahlen, The effect of a general aspherical perturbation on the free oscillations of the Earth, Geophys. J. Roy. Astron. Soc., 53, 335--354, 1978.

75

Wu, R.-S., Wide-angle elastic wave one-way propagation in heterogeneous media and an elastic wave complex screen method, J. Geophys. Res., 99, 751--766, 1994.

76

Wysession, M. E., and P. J. Shore, Visualization of whole mantle propagation of seismic shear energy using normal mode summation, Pure and Appl. Geophys., 142, 295--310, 1994.

77

Xie, X.-B., and T. Lay, The excitation of waves by explosions: A finite-difference investigation, Bull. Seism. Soc. Am., 84, 324--342, 1994.

78

Yoon, K.-H., and G. A. McMechan, 3-D finite difference modeling of elastic waves in borehole environments, Geophys., 57, 793--804, 1992.

79

Yu, Y., and J. Park, Upper mantle anisotropy and coupled-mode long-period surface waves, Geophys. J. Int., 114, 473--489, 1993.

80

Yu, Y., and J. Park, Hunting for azimuthal anisotropy beneath the Pacific Ocean region, J. Geophys. Res., 99, 15399--15422, 1994.

81

Zeng, Y., Theory of scattered P and S waves energy in a random isotropic scattering medium, Bull. Seism. Soc. Am., 83, 1264--1276, 1993.

82

Zhao, L., and F. A. Dahlen, Asymptotic eigenfrequencies of the Earth's normal modes, Geophys. J. Int., 115, 729--758, 1993.

83

Zhao, T., and M. Dravinski, Resonance prediction of deep sediment valleys through an eigenvalue method, Geophys. J. Int., 117, 749--762, 1994.