2023 Fiscal Year Annual Research Report
Investigation of site amplification at Ocean Bottom stations in the Japan Trench area for earthquake early warning
| Project/Area Number |
20K05055
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| Research Institution | National Research Institute for Earth Science and Disaster Prevention |
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Principal Investigator |
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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| Co-Investigator(Kenkyū-buntansha) |
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若井 淳 国立研究開発法人防災科学技術研究所, マルチハザードリスク評価研究部門, 特別研究員 (20869151) [Withdrawn]
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | Site amplification / Nonlinear site response / Earthquake early warning / S-net / Source spectra / Path factors / Japan Trench / Earthquakes |
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| Outline of Annual Research Achievements |
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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