| 研究課題/領域番号 |
20K05055
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分25030:防災工学関連
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| 研究機関 | 国立研究開発法人防災科学技術研究所 |
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研究代表者 |
Dhakal Yadab 国立研究開発法人防災科学技術研究所, 地震津波火山ネットワークセンター, 主任専門研究員 (60708890)
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| 研究分担者 |
山中 浩明 東京工業大学, 環境・社会理工学院, 教授 (00212291)
若井 淳 国立研究開発法人防災科学技術研究所, マルチハザードリスク評価研究部門, 特別研究員 (20869151)
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| 研究期間 (年度) |
2020-04-01 – 2024-03-31
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| 研究課題ステータス |
完了 (2023年度)
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| 配分額 *注記 |
4,030千円 (直接経費: 3,100千円、間接経費: 930千円)
2022年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
2021年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
2020年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
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| キーワード | Site amplification / Nonlinear site response / Earthquake early warning / S-net / Source spectra / Path factors / Japan Trench / Earthquakes / Strong motion / Attenuation / Ocean bottom seismograph / Path attenuation / Strong motions / Strong motion prediction / Damaging earthquakes / K-NET/KiK-net / site amplification / ocean bottom / earthquake early warning |
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| 研究開始時の研究の概要 |
The site conditions beneath the S-net are poorly known. We estimate site amplifications at the S-net stations with respect to rock sites on land using earthquake records. The results provide fundamental information on the site conditions in the source region of large subduction zone earthquakes.
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| 研究実績の概要 |
We examined nonlinear site amplification properties at the S-net seafloor sites during three magnitude 7 class earthquakes in the last year. We found that the seafloor sites experience relatively larger degree of nonlinear site response compared to the nearby land sites. Also, we found that the relatively poor coupling between sediments and sensors at the seafloor sites complicates the accurate analysis of site response for strong shakings. A foundational work was performed to estimate 3D attenuation structure in the seafloor region and results were presented in 2023 Japan Geoscience Union Meeting. In addition, we presented our study findings about the site amplification at the S-net sites in 28th IUGG (International Union of Geodesy and Geophysics) General Assembly held in Berlin in 2023.
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