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Research Reactor Institute Kyoto University, Noda, Kumatori-cho, Sennan-gun, Osaka, 590-04, Japan+81-724-51-2369; +81-724-51-2603; kamae{at}kuca.rri.kyoto-u.ac.jp
D.P.R.I., Kyoto University, Gokasho, Uji, Kyoto, 611, Japan+81-774-33-5866; +81-774-33-5866; irikura{at}egmdpri01.dpri.kyoto-u.ac.jp
Woodward-Clyde Federal Services, 566 El Dorado Street, Suite 100, Pasadena, California 91101818-449-7650; 818-449-3536axpitar0{at}wcc.com
Abstract
A method for simulating strong ground motion for a large earthquake based on synthetic Green's function is presented. We use the synthetic motions of a small event as Green's functions instead of observed records of small events. Ground motions from small events are calculated using a hybrid scheme combining deterministic and stochastic approaches. The long-period motions from the small events are deterministically calculated using the 3D finite-difference method, whereas the high-frequency motions from them are stochastically simulated using Boore's method. The small-event motions are synthesized summing the long-period and short-period motions after passing them through a pair of matched filters to follow the omega-squared source model. We call the resultant time series "hybrid Green's functions" (HGF). Ground motions from a large earthquake are simulated by following the empirical Green's function (EGF) method. We demonstrate the effectiveness of the method at simulating ground motion from the 1995 Hyogo-ken Nanbu earthquake (Mw 6.9).
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