2013 Fiscal Year Final Research Report
Developping a method for monitoring the plate interface with land and seafloor observations
| Project/Area Number |
24740313
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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 |
Solid earth and planetary physics
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
TONEGAWA Takashi 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (60610855)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | レシーバ関数 / ノイズ / 時間変化 / 自己相関 / 海底記録 |
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| Research Abstract |
Using ambient noise records observed at ocean bottom seismometers in the northwestern Pacific, we could detect S reflection from the bottom of marine sediments. In this study, we observed a velocity reduction associated with the 2011 Tohoku-Oki earthquake by travel time of the S reflection. Moreover, we applied receiver function analysis to seismic records observed at DONET and land stations, and revealed a seismic velocity model in the Nankai subduction zone. Although we applied the ambient noise analysis to DONET records, we could not find any reflections, whose travel time can be predicted by the obtained structure. However, we can use receiver functions for monitoring subseafloor structure.
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