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Bulletin of the Seismological Society of America; June 2004; v. 94; no. 3; p. 789-802; DOI: 10.1785/0120030125
© 2004 Seismological Society of America
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Article

Inslab Earthquakes of Central Mexico: Q, Source Spectra, and Stress Drop

Daniel García, Shri Krishna Singh, Miguel Herráiz, Javier Francisco Pacheco and Mario Ordaz

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.)

Instituto de Geofísica, UNAM
Ciudad Universitaria
Coyoacán 04510
Mexico D.F., Mexico
(S.K.S., J.F.P.)

Instituto de Ingeniería, UNAM
Ciudad Universitaria
Coyoacán 04510
Mexico DF, Mexico
(M.O.)

We analyze 17 intermediate-depth, normal-faulting, inslab earthquakes of Mexico (4.1 ≤ Mw ≤ 7.4; 35 km ≤ H ≤ 118 km), recorded on hard sites at local and regional distances (R ≤ 600 km), to study spectral attenuation of seismic waves, quality factor Q, source spectra, and Brune stress drop. Assuming 1/R geometrical spreading, the quality factor is given by Q(f) = 251f0.58. Although there is considerable uncertainty in Q due to the trade-off between geometrical spreading and Q, this uncertainty does not influence strongly the estimation of source spectra and stress drops. We find that source spectra of nine events (4.1 ≤ Mw ≤ 6.4) follow the {omega}2 model, while those of the other eight (5.8 ≤ Mw ≤ 7.4) significantly deviate from it. Interpreting the high-frequency level of the source spectra with the {omega}2 model yields a nearly constant stress drop, {Delta}{sigma}, with a median value of 304 bars. This is more than 4 times greater than the corresponding value for interplate earthquakes in central Mexico. The observed source acceleration spectra, S(f), is, however, better fit by an empirical source spectrum characterized by two corner frequencies, fa and fb, such that S(f) = f2M0/[{1 + (f/fa)2} · {1 + (f/fb)2}]1/2, where fa = 4.962 x 1010/M00.454, fb = 4.804 x 105/M00.213, and M0 is in dyne centimeters. This empirical source spectrum may be useful in predicting ground-motion parameters using stochastic methods.




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