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Tono Geoscience Center, JNC.
Toki, Gifu 509-5102
Japan
(A.J.)
Disaster Prevention Research Institute
Kyoto University
Uji, Kyoto 611-0011
Japan
(M.A.)
Department of Civil Engineering
University of Costa Rica
San Jose, Costa Rica
(C.A.M.)
Velocity seismograms recorded at nine local stations from 102 small
earthquakes on the Atotsugawa fault zone, central Japan, with seismic moment
from 3 x 1017 to 3 x 1021 dyne cm are
analyzed to obtain the S-wave spectra. A genetic algorithm is applied
to determine the earthquake source parameters and site responses
simultaneously. The stability of both site responses and source parameters are
experimentally tested as well as the effects of different Q models.
The resulting source parameters show that the stress drops appear to vary
systematically with the location of earthquakes. Events located on the Mozumi
fault or the junction of the Mozumi and the Atotsugawa faults have higher
stress drops than those on the creeping section and southernmost part of the
Atotsugawa fault. The relationship between seismic moment and corner frequency
constructed by combining our results and those of Iio
(1986) for other regions in
Japan shows that a single scaling relation does not apply in a moment range of
1010 to 1025 dyne cm. A steplike change in scaling
relationship occurs between 5 x 1018 and 5 x
1020 dyne cm corresponding to corner frequencies between 15 and 25
Hz. This observation suggests that earthquakes are most likely a
multihierarchical system divided by characteristic sizes. According to Aki's
(1980) model, a characteristic
source dimension (
100–200 meters) may represent a critical size of
the barriers distributed in the fault zone at which the barrier effects are
balanced by the dynamic effect of the source process.
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