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Bulletin of the Seismological Society of America; August 1996; v. 86; no. 4; p. 981-990
© 1996 Seismological Society of America
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Elastic finite-difference modeling of strong motion in Ashigara Valley for the 1990 Odawara, Japan, earthquake

Arben Pitarka, Daisuke Suetsugu and Hiroshi Takenaka

Disaster Prevention Research Institute Kyoto University Gokasho, Uji, Kyoto, 611 Japan
International Institute of Seismology and Earthquake Engineering 1 Tatehara, Tsukuba, Ibaraki 305, Japan
Department of Earth and Planetary Sciences Faculty of Science Kyushu University, Fukuoka 812-81, Japan

Abstract

Finite-difference seismograms are calculated for the 1990 Odawara earthquake to model transverse and radial components of strong-motion data. Using a basin structure derived from a geotechnical survey and double-couple solution determined from P first-motion data and SH/SV amplitude ratio, two-dimensional SH and P/SV finite-difference calculation, along with correction for soft surface layers, reproduces the observed spatial variation in amplitude and waveform of the transverse and radial records at the Ashigara Valley blind prediction sites for frequencies up to 2 Hz. Comparison of the synthetic and the observed seismograms suggests that the observed spatial variation in the SH amplitude is attributed to the source radiation and amplification due to the soft surface layers, while the SV amplitude variation is controlled by the amplification due to the sedimentary basin as well as the source and surface-layer effects.




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