Investigation of site amplification at Ocean Bottom stations in the Japan Trench area for earthquake early warning
| Project/Area Number |
20K05055
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 25030:Disaster prevention engineering-related
|
|---|
| Research Institution | National Research Institute for Earth Science and Disaster Prevention |
|---|
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)
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2020-04-01 – 2024-03-31
|
| Project Status |
Completed (Fiscal Year 2023)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
|
|---|
| Keywords | 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 |
|---|
| Outline of Research at the Start |
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.
|
| 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.
|
Report
(4 results)
Research Products
(25 results)
-
-
-
-
-
-
-
-
-
[Presentation] Simultaneous estimation of source, path, and site spectra from the S-net strong-motion records in the Japan Trench area2022
Author(s)
Dhakal, Y.P., Kunugi T., Aoi, S., Yamanaka, H.
Organizer
Annual Meeting, Seismological Society of Japan, Abstract ID S15P-02
Related Report
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
