As a guest user you are not logged in or recognized by your IP address. You have
access to the Front Matter, Abstracts, Author Index, Subject Index and the full
text of Open Access publications.
Dynamic soil properties estimated from downhole array data recorded at the Kashiwazaki-Kariwa nuclear facility in the 2007 Niigata-ken Chuetsu-oki earthquakes
Dynamic properties of soil deposits at two sites (one near Unit 5 and the other near the Service Hall) at the Kashiwazaki-Kariwa nuclear power plant were back calculated using strong motion recordings obtained during the 2007 Niigata-ken Chuetsu-oki earthquakes. The method used to figure this inversion was genetic algorithm, coupled with a one-dimensional equivalent linear response analysis, in which damping ratios will vary with the Fourier shear strain amplitude in the frequency domain. Our back-analysis has demonstrated that the surface layer at the Service Hall consisting of Holocene and Pleistocene dune sands showed strong nonlinear behavior during the main shock, with the underlying Pliocene Nishiyama Formation remaining elastic. The Pleistocene Yasuda Formation occurring near the ground surface at Unit 5, as well as the underlying Nishiyama and Shiiya Formations, also remained nearly elastic, but exhibited higher damping ratios. It is believed that the different dynamic soil behavior between the two sites may have led to the strikingly different site amplification between the two sites during the main shock.
This website uses cookies
We use cookies to provide you with the best possible experience. They also allow us to analyze user behavior in order to constantly improve the website for you. Info about the privacy policy of IOS Press.
This website uses cookies
We use cookies to provide you with the best possible experience. They also allow us to analyze user behavior in order to constantly improve the website for you. Info about the privacy policy of IOS Press.