Relationship of S-wave Velocity Structures and Site Effects Separated from the Observed Strong Motion Data of K-NET, KiK-net, and JMA Network

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  • K-NET, KiK-net, JMA震度計観測網による強震記録から分離したサイト増幅特性とS 波速度構造との対応

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Adequate evaluation of the strong motion characteristics is indispensable for quantitative strong motion prediction. For empirical prediction we need relationships between averaged S-wave velocity of ground and site amplification factors. For theoretical prediction we need S-wave velocity structures themselves. In this paper, we utilize separated site factors obtained from strong motion data of K-NET, KiK-net, and the JMA Shindo-kei network in Japan. Based on the spectral site factors and one-dimensional theoretical S-wave amplification analysis, we invert the best S-wave velocity structures for 1, 300 sites in Japan. We obtained very good results for 404 sites among them. At the same time we separate site factors for strength indexes such as Peak Ground Acceleration and Peak Ground Velocity. We then try to find the relationships between spectral site factors and site factors of these strength indexes and averaged S-wave velocity of ground. After thorough studies we conclude that the averaged S-wave velocity over only 10m from the surface is sufficient to predict site factors quantitatively for PGA and PGV, as well as JMA seismic intensity scale.

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