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Imaging the Moho and Subducted Oceanic Crust at the Isthmus of Tehuantepec, Mexico, from Receiver Functions |
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| Authors: | Diego Melgar Xyoli P��rez-Campos |
| Institution: | 1. Facultad de Ingenier??a, Universidad Nacional Aut??noma de M??xico, Coyoac??n, 04510, Mexico, D.F., Mexico 3. Scripps Institution of Oceanography, University of California San Diego, 8800 Biological Grade, La Jolla, San Diego, CA, 92093-0225, USA 2. Departamento de Sismolog??a, Instituto de Geof??sica, Universidad Nacional Aut??noma de M??xico, Circuito de la Investigaci??n, s/n, Ciudad Universitaria, Coyoac??n, 04510, Mexico, D.F., Mexico |
| Abstract: | Using teleseismic data recorded along a transect, which we call VEOX (for Veracruz-Oaxaca seismic line), of 46 broadband stations installed across the Isthmus of Tehuantepec in southern Mexico, we obtained receiver functions and stacked them to study the Moho topography and back projected them to visualize the subducted slab geometry beneath the isthmus. We observed a back-azimuth dependent Moho thickness across the transect, particularly beneath the Los Tuxtlas Volcanic Field. Also, we observed the Cocos plate which subducts with an angle of 26° between 140 and 310?km from the trench. Comparison with regional seismicity indicates that it occurs below the oceanic crust. |
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