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- W1495508944 abstract "We analyze 17 intermediate-depth, normal-faulting, inslab earthquakes of Mexico (4.1 M w 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 ) 251f 0.58 . Although there is consid- erable 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 x 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 x 2 model yields a nearly constant stress drop, Dr, 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, f a and f b, such that S(f ) f 2 M0/({1 (f /f a) 2 } • {1 (f /f b) 2 }) 1/2 , where f a 4.962 10 10 /M0 0.454 , f b 4.804 10 5 /M0 0.213 , and M0 is in dyne centimeters. This empirical source spectrum may be useful in predicting ground-motion parameters using sto- chastic methods." @default.
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- W1495508944 date "2004-06-01" @default.
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- W1495508944 title "Inslab Earthquakes of Central Mexico: Q, Source Spectra, and Stress Drop" @default.
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- W1495508944 doi "https://doi.org/10.1785/0120030125" @default.
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