Seismic structure beneath the Rivera subduction zone from finite-frequency seismic tomography
Por:
Yang T., Grand S.P., Wilson D., Guzman-Speziale M., Gomez-Gonzalez J.M., Dominguez-Reyes T., Ni J.
Publicada:
9 ene 2009
Resumen:
The subduction zone of western Mexico is a unique region on Earth where microplate capture and overriding plate disruption are occurring today. The young, small Rivera plate and the adjacent Cocos plate are subducting beneath the Jalisco block of Mexico. Here, we present a P wave tomographic model of the upper mantle to 400 km depth beneath the Jalisco block and surrounding regions using teleseismic P waves recorded by the Mapping the Rivera Subduction Zone (MARS) and Colima Volcano Deep Seismic Experiment (CODEX) seismic arrays. The inversion used 12,188 P wave residuals and finite-frequency theory to backproject the 3-D traveltime sensitivity kernels through the model. Below a depth of 150 km, the tomography model shows a clear gap between the Rivera and Cocos slabs that increases in size with depth. The gap between the plates lies beneath the northern part of the Colima graben and may be responsible for the location of Colima volcano. The images indicate that the deep Rivera plate i
Filiaciones:
Yang T.:
School of Ocean and Earth Sciences, Tongji University, 1239 Siping Road, Shanghai 200092, China
Grand S.P.:
Department of Geological Sciences, University of Texas, 1 University Station, C1100, Austin, TX 78712-0254, United States
Wilson D.:
Department of Geological Sciences, University of Texas, 1 University Station, C1100, Austin, TX 78712-0254, United States
Guzman-Speziale M.:
Ctr Geociencias, Queretaro 76001, QRO, Mexico
Gomez-Gonzalez J.M.:
Ctr Geociencias, Queretaro 76001, QRO, Mexico
Dominguez-Reyes T.:
Observatorio Vulcanologico, Universidad de Colima, Av. Gonzalo de Sandoval 444, Colima, COL 28040, Mexico
Ni J.:
Physics Department, New Mexico State University, Las Cruces, NM 88003, United States
All Open Access; Bronze
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