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Laboratorio de Ingeniería Sísmica
Instituto de Investigaciones en Ingeniería
Universidad de Costa Rica
San José, Costa Rica
(A. M.)
Instituto de Ingeniería
Ciudad Universitaria
Apdo. Postal 70-472
Coyoacán, C.P. 04510
México, D. F., Mexico
(J. A.)
D.P.R.I., Kyoto University
Gokasho, Uji
Kyoto, 611-0011, Japan
(K. I.)
The low-frequency flat levels and corner frequencies of the aftershocks of
the Kobe earthquake, together with the site effects of the recording stations,
are inverted by using genetic algorithms. All records were corrected by the
quality factor, Q, of propagation-path, and for each aftershock, a
different omega-squared model was assumed such that the low-frequency flat
levels and corner frequencies would minimize the standard deviation of the
site effects at all stations. It was observed that site effects for rock sites
showed significant amplification at high frequencies. This amplification was
found to correlate with spectral ratios of records located at 70-m depth and
at the surface for one of the stations. After estimating the seismic moment
and the stress drop, it was observed that the relation of the seismic moment,
M0, versus the corner frequency, fo, followed the
scaling law M0 
fo–3.
Large values of stress drop were found around asperities on the fault zone and
at depth.
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