統計的グリーン関数法に基づく地震動最大振幅に対する破壊伝播効果による方位依存性の評価

概要

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The effects of rupture directivity on strong ground motion are evaluated by ground motion simulation based on the stochastic green's function. For evaluating the influence of the directivity effect in attenuation relationships, the directivity effect factor D is introduced, which is the ratio of the amplitude of the simulated motion by the average amplitude from the attenuation relationship. The results indicate that, for earthquakes with vertical and unilateral faulting, there are strong directivity effects on peak ground acceleration and peak ground velocity. The distributions of D value are represented by simple functions. By using the factor, the ground motion intensity predicted by an attenuation relationship can be corrected considering the directivity effects. The method is applied to the records observed during the 1979 Imperial Valley, California, earthquake. The results show that the predicted value by the proposed factor matched the observed one well, and suggest that the proposed method is effective for evaluating the rupture directivltv effects.
2001-08-30