統計的グリーン関数法による1923年関東地震(M_<JMA>7.9)の広域強震動評価

概要

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Seismological-bedrock motions for the 1923 Kanto earthquake (M_<JMA> 7.9) in the Tokyo Metropolitan area were simulated based on stochastic Green's functions for S-waves (Boore, 1983; Satoh et al., 1994c) and a variable-slip rupture model (Wald and Somerville, 1995). Engineering-bedrock motions were also calculated with the Kanto Basin model (Sato et al., 1999). Next, a strong ground motion at the JMA Tokyo was calculated with a surface-soil model, showing a good agreement with a strong ground motion simulated by an empirical Green's function method (Dan and Sato, 1998). Finally, isoseismal maps of peak ground velocities and instrumental seismic intensities in the area were evaluated based on the Digital National Land Information, showing a good agreement again with the JMA seismic intensities at Tokyo, Mera, and Yokosuka (JMA, 1996) and with a distribution map of the ratio of collapsed houses (Kayano, 1992).
2000-04-30