| Project/Area Number |
26400455
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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 | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小川 康雄 東京工業大学, 理学院, 教授 (10334525)
山崎 健一 京都大学, 防災研究所, 助教 (20436588)
寺石 眞弘 京都大学, 防災研究所, 助教 (50109071)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 地球電磁気 / 地震 / スロースリップ / 比抵抗構造 |
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| Outline of Final Research Achievements |
Recent geodetic observations detect recurrent slow slip events (SSEs), which occurred beneath the Bungo Channel and southwest Shikoku Island, with interval of approximately 6 years. In order to reveal a large-scale three-dimensional resistivity structure around this SSEs region, we carried out wideband magnetotelluric (MT) surveys around the western part of Shikoku Island. Using obtained MT responses, we constructed a three-dimensional resistivity model around the eastern half of SSE region. We inverted the impedance tensor and the vertical magnetic transfer function. The main features of the three-dimensional model are moderate conductive zone in the central part of SSEs with surrounding conductor at the edge of SSEs along the upper boundary of the Philippine Sea slab, and a strong conductor beneath SSEs.
We have also established a permanent long-term MT monitoring network that aims to detect temporal changes of resistivity structure during SSE cycle.
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