HR: 08:20h
AN: S51C-02 INVITED     [Abstracts]
TI: Receiver Function Modeling of the Central Mexico Slab and Comparison to MASE Data
AU: * Kim, Y
EM: ykim@gps.caltech.edu
AF: Seismological Laboratory, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Clayton, R W
EM: clay@gps.caltech.edu
AF: Seismological Laboratory, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Greene-Gondi, F
AF: UNAM, Programa de Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico
AU: Espejo-Arellano, L
AF: UNAM, Programa de Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico
AU: Pérez-Campos, X
AF: UNAM, Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico
AB: We have produced an image of the subducted Cocos plate beneath Central Mexico with receiver functions utilizing data from Meso-America Subduction Experiment (MASE). The receiver functions show that the subducting oceanic crust is shallow, dipping to the north at 15 degrees for 80 km from Acapulco and then horizontally underplates the continental crust for 200 km, all the way to the beginning of the Trans Mexico Volcanic Belt (TMVB). The continental Moho is about 40 km deep beneath the TMVB and shallows towards the north. The region under the TMVB and further north is less clear in the images. To further investigate this region we produce synthetic receiver functions with a 2D finite-difference wave propagation program for particular velocity and slab models and compare these to the data. The receiver function image is produced by migration of the receiver functions, with several different velocity functions. Seismic multiples are also included in the image because in some portions of the receiver functions they are stronger than the primary conversions.
DE: 7205 Continental crust (1219)
DE: 7220 Oceanic crust
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8170 Subduction zone processes (1031, 3060, 3613, 8413)
SC: Seismology [S]
MN: 2007 Joint Assembly