HR: 0800h
AN: T51B-0541    [Abstracts]
TI: Modeling Of The Seismic Response Of The Flat Slab In Central Mexico
AU: Kim, Y
EM: ykim@gps.caltech.edu
AF: Seismological Lab, Caltech, 1200 E. California Blvd., Pasadena, CA 91106, United States
AU: * Clayton, R W
EM: clay@gps.caltech.edu
AF: Seismological Lab, Caltech, 1200 E. California Blvd., Pasadena, CA 91106, United States
AU: Perez-Campos, X
EM: xyolipc@gmail.com
AF: Universidad Nacional Autónoma de México, Departamento de Sismología, Instituto de Geofísica, Mexico City, 03100, Mexico
AB: The subducted Cocos plate beneath Central Mexico as imaged with receiver functions from the MASE (Meso- American Subduction Experiment) array underplates the continental crust for a distance of approximately 300 km from the trench. In this study we investigate the azimuthal dependence of this image and construct a velocity model to match the impedance changes of the interface between the crust and slab as well as mid-crustal features. The receiver functions are modeled with a 2D finite-difference code. The initial results a low-velocity zone (lower than normal oceanic crustal velocities) are necessary to reproduce the impedance contrasts. We also use an inverse method to estimate the velocity changes.
DE: 7203 Body waves
DE: 7205 Continental crust (1219)
DE: 7220 Oceanic crust
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8170 Subduction zone processes (1031, 3060, 3613, 8413)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting