| 講演要旨(和文) | | 2011 年東北地方太平洋沖地震では、足柄平野西部で周期2〜3秒の長周期地震動が局所的に大きくなり、免震住宅に大きな変形を生じさせる主原因となった。本研究では、足柄平野西部の南足柄地域をテストサイトとして、深部地盤構造を明らかにすることを目的に、複数の現地調査を実施した。本講演では、その調査概要と速報結果について報告する。 |
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| | 講演要旨(英文) | | Long-period ground motions for a period of 2-3 seconds were excited in the western part of the Ashigara Valley, during the 2011 off the Pacific coast of Tohoku earthquake. To evaluate site effects for these periods in the Ashigara Valley, we installed temporary earthquake observations and performed subsurface structural surveys, such as array microtremor observations and microtremor measurements of single-station. In this paper, we report the outline of these observations and the tendency of Rayleigh wave phase velocities obtained by the SPAC method applied to data of array microtremors observations. |
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