Interplate coupling and transient slip along the subduction interface beneath Oaxaca, Mexico
Por:
Correa-Mora F., Demets C., Cabral-Cano E., Marquez-Azua B., Diaz-Molina O.
Publicada:
1 oct 2008
Resumen:
We describe and model GPS measurements of surface deformation from the Oaxaca segment of the Mexican subduction zone to characterize interseismic strain accumulation and episodic transient slip in this region and test seismologically-based models of strain accumulation and release along subduction interfaces. Deformation measured from 2001 to 2007 within our dense 31-station GPS array has consisted of (1) trench-normal horizontal contraction at rates that decrease monotonically inland from the coast, (2) rapid coastal subsidence that changes gradually to slow uplift at locations more than 100 km inland and (3) periods of transient slip that interrupt the otherwise steady deformation. Inverse modelling of transient station offsets in 2004 and 2006 indicates that transient slip along the subduction interface occurred downdip from the rupture limits of previous large earthquakes in this region in both 2004 and 2006. GPS site velocities that are corrected for the effects of this transient
Filiaciones:
Correa-Mora F.:
Geology and Geophysics, University of Wisconsin-Madison, Madison, WI 53706, United States
Demets C.:
Geology and Geophysics, University of Wisconsin-Madison, Madison, WI 53706, United States
Cabral-Cano E.:
Univ Nacl Autonoma Mexico, Inst Geofis, Dept Geomagnetismo & Explorac, Ciudad Univ, Mexico City 04510, DF, Mexico
Marquez-Azua B.:
DGOT/SisVoc, Universidad de Guadalajara, Av. Maestros y Mariano Barcenas, 93106 Guadalajara, Jalisco, Mexico
Diaz-Molina O.:
Univ Nacl Autonoma Mexico, Inst Geofis, Dept Geomagnetismo & Explorac, Ciudad Univ, Mexico City 04510, DF, Mexico
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