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de=(saint helens) au=hill

HR: 08:00h
AN: V31E-01 INVITED
TI: Imaging the Mount St. Helens Magmatic Systems using Magnetotellurics
AU: * Hill, G J
EM: g.hill@gns.cri.nz
AF: Australian Crustal Research Centre, Monash University, Melbourne, Australia
AU: * Hill, G J
EM: g.hill@gns.cri.nz
AF: GNS Science, Wellington, New Zealand
AU: Caldwell, T G
EM: g.caldwell@gns.cri.nz
AF: GNS Science, Wellington, New Zealand
AU: Heise, W
EM: wiebke.heise@gmail.com
AF: GNS Science, Wellington, New Zealand
AU: Bibby, H M
EM: h.bibby@gns.cri.nz
AF: GNS Science, Wellington, New Zealand
AU: Chertkoff, D G
EM: dchertkoff@mac.com
AF: Crystal Prism Consulting Inc, North Vancouver, Canada
AU: Burgess, M K
EM: mkburgess@gmail.com
AF: San Diego State University, San Diego, United States
AU: Cull, J P
EM: jim.cull@sci.monash.edu.au
AF: Australian Crustal Research Centre, Monash University, Melbourne, Australia
AU: Cas, R A
EM: r
AF: Australian Crustal Research Centre, Monash University, Melbourne, Australia
AB: A detailed magnetotelluric survey of Mount St. Helens shows that a conduit like zone of high electrical conductivity beneath the volcano is connected to a larger zone of high conductivity at 15 km depth that extends eastward to Mount Adams. We interpret this zone to be a region of connected melt that acts as the reservoir for the silicic magma being extruded at the time of the magnetotelluric survey. This interpretation is consistent with a mid-crustal origin for the silicic component of the Mount St. Helens' magmas and provides an elegant explanation for a previously unexplained feature of the seismicity observed at the time of the catastrophic eruption in 1980. This zone of high mid-crustal conductivity extends northwards to near Mount Rainier suggesting a single region of connected melt comparable in size to the largest silicic volcanic systems known.
DE: 0600 ELECTROMAGNETICS
DE: 0925 Magnetic and electrical methods (5109)
DE: 3619 Magma genesis and partial melting (1037)
DE: 8400 VOLCANOLOGY
DE: 8439 Physics and chemistry of magma bodies
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2009 Joint Assembly