2016 Fiscal Year Final Research Report
State imaging of electrical properties around the long-term Slow Slip Events for detection of temporal changes in resistivity structure
| 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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| Project Period (FY) |
2014-04-01 – 2017-03-31
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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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| Free Research Field |
地球内部電磁気学
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