経験的グリーン関数法による強震動予測-波形合成の手続き(procedure)とその問題点-

Abstract

A procedure of predicting strong ground motion is presented using empirical Green'sfunction and the spectral scaling law of seismic waves. The applicability of the procedure isexamined by synthesizing the ground motion from the mainshock of the 1980 Izu-Hanto-Toho-Oki earthquake. The spectral scaling is confirmed to follow the w2 model for themainshock and the small event used as empirical Green's function. The accelerograms at adistance larger than fault length can be well simulated using the synthetic method for the w2method with uniform slip velocity distribution. However, ground motion at closer distancemight be strongly influenced by spatial and temporal variation on slip and/ or stress drop onthe fault plane. Near-field ground motion can be considerably well simulated using a newsynthetic method for a heterogeneous faulting model.