Transition on the Geometry of the Cocos Plate in Central-Southern Mexico.

Monday, 15 December 2014
Miguel Á. Rodríguez-Domínguez1, Xyoli Perez-Campos1, Diana Valencia-Cabrera2, Robert W Clayton3, Francisco Cordoba-Montiel4, Carlos m Valdes-Gonzales1, Michael R Brudzinski5, Enrique Cabral-Cano6 and Alejandra Arciniega-Ceballos7, (1)UNAM National Autonomous University of Mexico, Mexico City, Mexico, (2)Universidad Autonoma de Guerrero, Guerrero, Mexico, (3)California Institute of Technology, Pasadena, CA, United States, (4)Universidad Veracruzana, Veracruz, Mexico, (5)University of Miami, Miami, FL, United States, (6)UNAM National Autonomous University of Mexico, Departamento de Geomagnetismo y Exploración, Instituto de Geofísica, Mexico City, Mexico, (7)UNAM National Autonomous University of Mexico, Institute of Geophysics, Mexico City, Mexico
The tectonic setting, produced by the interaction between the Cocos and North American plates, follows complex geometries along the Pacific coast. Previous studies in central Mexico showed that the slab dips nearly horizontally before steeply subducting into the continental mantle; in contrast, in southern Mexico, the slabs dips under the continental plate at a constant angle. Receiver functions from four seismic networks: GECO (Geometry of Cocos), SSN (Servicio Sismológico Nacional), OxNet (Oaxaca Network) and UV (Universidad Veracruzana) are used to study the crustal structure underneath the stations, and image the subducting Cocos plate in order to define the geometry and the transition angle in central-southern Mexico.