HR: 09:40h
AN: T31A-07 INVITED     [Abstracts]
TI: Modeling the Interseismic Coupling Phase, Silent Events and Subduction Geometry for the Guerrero Seismic Gap
AU: * Iglesias, A
EM: amg@ollin.igeofcu.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, México, DF 04510, Mexico
AU: Franco, S
EM: ivonne@ollin.igeofcu.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, México, DF 04510, Mexico
AU: Pérez-Campos, X
EM: xyoli@ollin.igeofcu.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, México, DF 04510, Mexico
AU: Singh, S
EM: krishna@ollin.igeofcu.unam.
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, México, DF 04510, Mexico
AU: Kostoglodov, V
EM: vladimir@servidor.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, México, DF 04510, Mexico
AB: The coast of a large portion of Guerrero state (Mexico) is a well known mature seismic gap. As part of monitoring this seismic gap, from late 90's decade, some permanent GPS have been installed and continuously operated in this zone recording the deformation regime associated to the steady state coupling phase. At the beginning of 2002, permanent GPS stations detected a drastic change of direction due to a slow slip event which lasted around 4 months (January-April) and had a seismic moment release equivalent to an earthquake of Mw~7.6. Recently (mid 2006), a new slow slip event was detected with a pattern of deformation that seems much more complicated than for the 2002 event. On the other hand, geometry of subducted plate and shallow crustal structure for this region remain not well constrained. For this reason an inter-institutional (UNAM-CALTECH and UCLA) project (MASE) was proposed in 2005. The main propose of this project is to constrain subduction geometry from an experiment consisting of a network of one hundred portable broadband seismic stations located on a line perpendicular to the Middle American Trench and crossing from Acapulco, Guerrero to Tempoal, Veracruz, Mex. In this work we present data modeling for the steady state and slow slip phases as well as some preliminary results of MASE experiment.
DE: 7205 Continental crust (1219)
DE: 8170 Subduction zone processes (1031, 3060, 3613, 8413)
SC: Tectonophysics [T]
MN: 2007 Joint Assembly