Geometry and state of stress of the downgoing Cocos plate in the Isthmus of Tehuantepec, Mexico

Details Geometry and state of stress of the downgoing Cocos plate in the Isthmus of Tehuantepec, Mexico Geometry and state of stress of the downgoing Cocos plate in the Isthmus of Tehuantepec, Mexico

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..773p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 773-776. Research supported by CONACYT, Minist

Physics

19

Mexico, Plates (Tectonics), Seismology, Subduction (Geology), Tectonics, Crustal Fractures, Earthquakes

Scientific paper

Results of a microseismic study of the Isthmus of Tehuantepec are reported. It is shown, in particular, that a rapid change occurs in the dip of the subducted slab separating the steep subduction regime of Chiapas and Central America from the subhorizontal Wadati-Benioff zone beneath southern Mexico. The change is accommodated by a smooth fold in the slab. The Cocos plate appears to flex over a distance of about 150 km to accomplish this change in dip. The change in dip and the increase of the maximum depth of the seismic zone may be related to the age differences of the Cocos plate across the Tehuantepec Fracture Zone.

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