New Insights of the Rivera and Cocos Plates Subduction Beneath the Jalisco Block

Abstract:

The subduction of the Rivera and Cocos Plate is a complex tectonic process that involves the limits between these two plates, changes in subduction angle and the transition between convergent and divergent tectonics settings. To obtain new insights of the Rivera and Cocos Plates geometry we analyze earthquakes recorded from 2006 to 2008 by the Mapping the Riviera Subduction Zone (MARS) as well as earthquakes recorded by the Jalisco Seismic Network (RESAJ). To obtain better results and definition of the subduction geometry we manually performed the detection and phase picking of the earthquakes. We also analyzed results from the Seismic Experiment to Characterize the Seismic and Tsunami Risk Associated to the Rivera Plate and Jalisco Block Structure (TSUJAL), this results include refraction-reflection lines perpendicular to the trench. We present seismicity maps along with a focal mechanism analysis of several earthquakes, as well as seismic refraction and reflection preliminary profile.