ARモデルを用いた強震地動の震源特性推定手法に関する研究 : 解析モデルの定数設定と実地震動波形への適用

抄録

In order to use the synthetic ground motions calculated from the fault model as input motion for earthquake resistant design of structures, it is necessary to estimate the source characteristics correctly. In this paper, the estimation method of the source time function by applying the autoregressive (AR) model to the tail part of the observed ground motions for the purpose of estimation the dynamic properties of the ground surface and the deep soil is proposed. Further, this procedure is applied to the 1983 NIHONKAI CHUBU (JAPAN SEA) EARTHQUAKE and the 1985 MICHOACAN EARTHQUAKE. The estimated source time function and the occurrence time lag of major events shows good correlation with other studies. As a conclusion, this analytical method using the AR model is availabel to estimate the source time function from the observed ground motions.