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| | Abstract | | In the Kashiwazaki-Kariwa Nuclear Power Plant of Tokyo Electric Power Company, the seismic ground motion of Unit 1, located in the south side of the site, was significantly larger than that of Unit 5, located in the north side of the site, in the 2007 Niigataken Chuetsu-oki earthquake. It could be thought that geological structure below the site had a huge influence on the seismic ground motion. In order to analyze the seismic ground motion characteristics in the site, we simulated the seismic ground motion with 2-D soil model in the area below the site. The 2-D soil model was formulated on the basis of the boring surveys in the site and the seismic prospecting surveys in and around the site, estimating the folding structure by the balanced cross-section method. From the result of ground motion simulation analysis, we concluded that seismic wave concentrated in the local area of the site with the influence of the folding structure, and the ground motion of Unit 1 became larger than that of Unit 5. |
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