３次元大規模ＦＥＭによる東海・東南海・南海連動地震の長周期地震動シミュレーション

We conduct a series of long period ground motion simulation of the Tokai-Tonankai-Nankai coupled earthquake considering 3-D subsurface ground model including large-scale sedimentary basin structures, Kanto, Nobi and Osaka plain. We examine the influence of the location of rupture starting point and the contribution of each earthquake to the estimation results of the coupled earthquake. The results showed the simulated ground motions of Nankai and Tonankai earthquakes are dominant in Osaka plain. Those of Tonankai earthquake and Tokai earthquake are dominant in Nobi plain and Kanto plain, respectively. The duration time of the simulated motions of Tokai-Tonankai-Nankai coupled earthquake becomes longer than that of each earthquake. Furthermore, it is found that the Nankai earthquake amplified the long period ground motions exceeding 10 seconds in the Nobi and Kanto plains when the rupture started from the south east point of the fault plain.