| Project/Area Number |
23340125
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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(Kenkyū-buntansha) |
NAWA Kazunari 独立行政法人産業技術総合研究所, 地質情報研究部門, 研究グループ長 (20262082)
IMANISHI Yuichi 東京大学, 地震研究所, 准教授 (30260516)
TAMURA Yoshiaki 国立天文台, 水沢VLBI観測所, 助教 (90150002)
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| Co-Investigator(Renkei-kenkyūsha) |
OKUBO Shuhei 東京大学, 地震研究所, 教授 (30152078)
KATO Aitaro 名古屋大学, 地環境学研究科, 准教授 (20359201)
ITO Takeo 名古屋大学, 環境学研究科, 助教 (40377982)
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥20,540,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥4,740,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2011: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Keywords | 地震 / 重力 / スロースリップ / 地殻流体 / 測地 |
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| Outline of Final Research Achievements |
In plate subduction zones, slow fault slips which do not emit seismic waves have been observed by geodetic measurements. They are called slow slip events and occur just beneath the source areas of anticipated inter-plate large earthquakes. Because a slow slip can trigger a large inter-plate earthquake, it is important to know when slow slips occur. Seismological studies have revealed that the presence of high pore-pressure fluids causes slow slips, and some models have shown that variations in the fluid pressure can affect the time when the next slow slip event is initiated. In this study, we conducted high-precision gravity measurements in Ishigaki and Iriomote Islands and detected gravity changes which could be interpreted as a result of a variation in the fluid pressure.
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