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Bulletin of the Seismological Society of America; December 2005; v. 95; no. 6; p. 2272-2282; DOI: 10.1785/0120050072
© 2005 Seismological Society of America
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Inslab Earthquakes of Central Mexico: Peak Ground-Motion Parameters and Response Spectra

Daniel García1, Shri Krishna Singh2, Miguel Herráiz1, Mario Ordaz3 and Javier Francisco Pacheco2

1 Departamento de Geofísica y Meteorología
Facultad de Ciencias Físicas
Universidad Complutense de Madrid (UCM)
Ciudad Universitaria
28040 Madrid, Spain
danielg{at}fis.ucm.es
 (D.G., M.H.)

2 Instituto de Geofísica
Universidad Nacional Autónoma de México
Ciudad Universitaria
Coyoacán 04510
Mexico D.F., Mexico
 (S.K.S., J.F.P.)

3 Instituto de Ingeniería
Universidad Nacional Autónoma de México
Ciudad Universitaria
Ciudad Universitaria
Coyoacán 04510
Mexico DF, Mexico
 (M.O.)

We developed equations to predict pseudoacceleration response spectra (5% damping), peak ground acceleration, and peak ground velocity at free-field rock sites for intermediate-depth, normal-faulting inslab earthquakes of Central Mexico. The data set comprises 16 earthquakes (5.2 ≤ Mw ≤ 7.4; 35 ≤ H ≤ 138 km) recorded at local and regional distances (R ≤ 400 km). It represents a homogeneous catalog with respect to tectonic regime, fault mechanism, and soil class. Our results show larger amplitudes in the epicentral area from inslab events than from interplate events, a consequence of higher stress drops during the former type of earthquakes. Peak ground accelerations from moderate to large (Mw >6.0) inslab events significantly exceed those from interplate events with similar magnitude, reaching almost three times for the largest events. The ground motion due to inslab events, however, decays faster than for the thrust events. Our results are in reasonable agreement with other studies based on Japanese and the worldwide data.




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 Seismological Research LettersHome page
S. K. Singh, M. Ordaz, J. F. Pacheco, L. Alcantara, A. Iglesias, S. Alcocer, D. Garcia, X. Perez-Campos, C. Valdes, D. Almora, et al.
A Report on the Atoyac, Mexico, Earthquake of 13 April 2007 (Mw 5.9)
Seismological Research Letters, November 1, 2007; 78(6): 635 - 648.
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