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Bulletin of the Seismological Society of America; October 1994; v. 84; no. 5; p. 1327-1335
© 1994 Seismological Society of America
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Modeling strong motion in the Ashigara Valley for the 1990 Odawara, Japan, earthquake

A. S. Pitarka*, H. Takenaka{dagger} and D. Suetsugu

International Institute of Seismology and Earthquake Engineering Building Research Institute, Tsukuba, Ibaraki 305, Japan
National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Ibaraki 305, Japan

Abstract

Finite-difference seismograms are calculated for the 1990 Odawara earthquake. Using a basin structure derived from a geotechnical survey and a double-couple solution determined from the P first-motion data, a two-dimensional SH finite-difference calculation reproduces the observed spatial variation in amplitude and waveform of the transverse records at the Ashigara Valley Blind Prediction Sites for frequencies lower than 2 Hz. Comparison of the synthetics and the observed seismograms suggests that the observed amplitude variation of the transverse records in the Ashigara Valley is mainly due to the source radiation pattern rather than the basin structure. Several different double couples are used in the waveform modeling to show the sensitivity of ground motion to the source mechanism. We thus conclude that it is important to use an appropriate focal mechanism to model near-field ground motion.

Footnotes

* Present address: Disaster Prevention Research Institute, Kyoto University, Uji 611, Japan.

{dagger} Present address: Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka 812, Japan.




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