Intermediate-depth earthquakes in Central Mexico: Implications for plate waves

Details Intermediate-depth earthquakes in Central Mexico: Implications for plate waves Intermediate-depth earthquakes in Central Mexico: Implications for plate waves

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..527s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 5, p. 527-530

Physics

5

Earthquakes, Mexico, Plates (Tectonics), Seismic Waves, Seismographs, Subduction (Geology), P Waves, S Waves, Seismology

Scientific paper

Regional seismographs of intermediate-depth earthquakes (50 equal to or less than H equal to or less than 80 km) that occur below the Central Mexican Plateau show a phase which, at epicentral distances of 150 to 450 km, arrives about 15 to 20 sec after the P wave and 5 to 12 sec before the S wave. This phase was previously interpreted as a seismic wave refracted from a dipping interface below the source, thus apparently providing direct evidence of the structural location of the subducted Cocos plate below Mexico. The phase was called the plate wave. Recent intermediate-depth events have given rise to better quality data recorded by some newly-installed broadbend seismographs. An analysis of these and previous data strongly suggests that the phase is an S-to-P converted phase at the free surface and, therefore, provides no information regarding the subducted plate.

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