2018 Fiscal Year Final Research Report
A study on strong ground motion in sedimentary basin near plate boundary
| Project/Area Number |
16K16370
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Research Collaborator |
TAKAI Nobuo
BIJUKCHHEN Subeg
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 震源断層近傍 / 堆積盆地 / 強震動予測 / 2015年ネパール・ゴルカ地震（Mw7.8） / カトマンズ盆地 |
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| Outline of Final Research Achievements |
Generally, the strong ground motion is strongly affected by the sedimentary basin. Slip pulse motions are generated when the seismic source fault is located near the seismic station. In this study, we explored the generation mechanism of the slip pulse motion which is observed on the rock site in the Kathmandu Valley during the 2015 Gorkha Nepal earthquake. We revealed that this slip pulse motion is largely affected by the near-field and the intermediate terms from the nearest slip area and amplified by the basin.
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| Free Research Field |
地震工学
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| Academic Significance and Societal Importance of the Research Achievements |
2015年ネパール・ゴルカ地震のカトマンズ盆地の堆積上観測点における強震動は，周期3～5秒において大きなパワーを有し，日本の現行の建築基準法で規定する告示波の応答スペクトルを上回る過去に経験したことの無い長周期に強力な破壊力のあるものであり，その強震動の生成メカニズムの解明は重要である．
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