Plate waves and the 1980 huajuapan de leon, Mexico earthquake
1985; Elsevier BV; Volume: 112; Issue: 1-4 Linguagem: Inglês
10.1016/0040-1951(85)90191-x
ISSN1879-3266
AutoresF. A. Nava, Vered Toledo, Cinna Lomnitz,
Tópico(s)Seismic Waves and Analysis
ResumoWe propose two alternate structural models featuring a dipping oceanic plate in the subduction zone of southwestern Mexico, based on the relocation, by the Master Event method, of 77 aftershocks of the 1980 Huajuapan, Mexico earthquake, recorded by the Mexican Continental Aperture Seismic Network (RESMAC). The aftershock locations roughly define the rupture surface of the main event as a normal fault dipping towards the continent. The rupture involved a thickness of about 25 km in the top of the subducted plate. These results are consistent with the fault plane solution. Both models feature a waveguide in the top of the subducted plate, which may account for the large relative amplitudes of plate waves relative to direct waves at all stations, and the large high frequency content observed at a station on the coast, compared with stations inland.
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