2014 Fiscal Year Final Research Report
New tilt observation at the seafloor based on the latest ocean bottom seismometer technology
| Project/Area Number |
23540489
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SHINOHARA Masanao 東京大学, 地震研究所, 教授 (90242172)
ISSE Takehi 東京大学, 地震研究所, 助教 (60359180)
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 海底地殻変動観測 / 傾斜変動観測 / 広帯域地震計 / 広帯域海底地震計 / BBOBS-NX / BBOBST-NX / スロースリップイベント / 底層流 |
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| Outline of Final Research Achievements |
Geodetic observations at the seafloor will play important role to understand the stage of earthquake occurring. We have performed the development and several tests of the BBOBST-NX, which enables the broadband seismic and tilt observation at the seafloor, after the land test in 2010. The practical long-term test observation off Boso Peninsula, where sloe slip events (SSE) recurred, had been started in April 2013. In January 2014, the SSE occurred, and we recovered the BBOBST-NX in April 2014. After the analysis, a large tilt signal (5~ micro rad) near the period of the SSE was recognized. Although the maximum velocity of the bottom current at this site was 35 cm/s, we could observe this tilt signal clearly. So that, effectiveness of the tilt observation at the seafloor by the BBOBST-NX is proved well. We will continue more detailed test observations of two-years-long period at two different sites in 2015 for evaluation of annual change in the tilt dara.
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| Free Research Field |
海底地震学
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