SEGJ Technical Conference

Modeling 3D Velocity Structure in the Fault Region of the 2007 Niigataken Chuetu-Oki Earthquake with Folding Structure

Abstract In this study, we have constructed the velocity model including the folding structure near the Kashiwazaki-Kariwa nuclear power (KKNP) plant where the large ground motions have been recorded for the 2007 Niigataken Chuetsu-Oki earthquake (M6.8). We could reproduce the general features of ground motion on the KKNP plant by the simulation of finite difference method for moderate sized events which occurred on the fault area of main shock and the aftershock of the 2004 Chuetsu earthquake. These results of simulation indicate that the constructed velocity model worked well and that the folding structure beneath the KKNP plant played an important role during the main shock of Chuetsu-Oki earthquake.