断層の非一様すべり破壊を考慮した半経験的波形合成法による強震動予測

概要

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A variable-slip rupture model of a large-earthquake fault is taken into account in a semi-empirical method for predicting strong-ground motions. The source spectrum of the (p, q)-th sub-fault is represented by the omega-square model with two corner circular frequencies. The one is V_<pq>/D_<pq>, where V_<pq> is the maximum slip velocity and D_<pq> is the final slip, and the other is 2 β_<pq>λ_<pq>, where β_<pq> is the shear-wave velocity of the medium and λ_<pq> is the equivalent radius of the sub-fault. This new method is applied to the variable-slip rupture model of the 1923 Kanto earthquake obtained by Wald and Somerville (1995). The synthesized strong-ground accelerations are consistent with the seismic intensities reported by the Japan Meteorological Agency and with those estimated from the overturned tomb stones and the collapsed houses.
1998-07-30