HR: 10:20h
AN: T32A-01    [Abstracts]
TI: Seismic Structure of the Subducted Cocos Plate
AU: * Clayton, R W
EM: clay@gps.caltech.edu
AF: Seismo Lab, Caltech, MC252-21, Pasadena, CA 91125, United States
AU: Davis, P M
EM: pdavis@ess.ucla.edu
AF: ESS, UCLA, 595 Charles Young Dr Box 951567, Los Angeles, CA 90095, United States
AU: Perez-Campos, X
EM: xyolipc@gmail.com
AF: Dept de Sismologia, UNAM, Institute of Geophysics, Mexico City, DF , Mexico
AB: The Meso-American Subduction Experiment (MASE) was designed to determine the critical parameters to necessary to simulate the subduction process in Central Mexico . A preliminary analysis of the data shows a 200km section of the slab that is subhorizontal and to within the resolution of the receiver functions it underplates the continental crust with no intervening asthenosphere. This is an interesting situation because the short-term (GPS) and long-term (geologic) strain measurements show almost no compressive strain in this region. This would imply that the crust is decoupled from the subducting slab. Near the coast, the receiver functions show that the slab cuts through the crust at an approximately a 15-degree angle, and under the Trans-Mexican Volcanic Belt the slab becomes detached from the crust, but its geometry at depth is not yet determined from the receiver functions, but a well-developed mantle wedge is apparent from the attenuation of regional earthquakes.
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8120 Dynamics of lithosphere and mantle: general (1213)
DE: 8170 Subduction zone processes (1031, 3060, 3613, 8413)
SC: Tectonophysics [T]
MN: 2007 Joint Assembly