Improvement of geoelectrical resistivity structures around Philippine Sea plate boundary beneath Shikoku distric
| Project/Area Number |
24540454
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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 | Kochi University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Satoru 大阪市立大学, 理学(系)研究科, 教授 (70191228)
SHIOZAKI Ichiro 鳥取大学, 工学(系)研究科, 准教授 (80221290)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 四国 / フィリピン海プレート / 比抵抗 / 低周波微動 / ネットワークＭＴ / 比抵抗構造 / スラブ地震 / MT応答レスポンス / ＭＴ応答レスポンス |
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| Outline of Final Research Achievements |
This study aims to improve accuracy of geoelectrical resistivity structures around Philippine Sea plate boundary beneath Shikoku district, especially central and western Shikoku district, using the Network-magnetotelluric (MT) method. We determined MT response functions in the period range of 100-10000s at several observation sites in Shikoku district. In central Shikoku the comparison between the observed MT response functions and the theoretical MT response functions calculated from 2-dimensional resistivity structures indicated the possibility of the resistivity structure similar to that under the eastern Shikoku, which has lower resistivity lower crust , lower resistivity oceanic crust and high resistivity plate. In the western Shikoku a lower resistivity (~10ohm-m) area at depth of 30-40km, which is corresponding to the region in which non-volcanic low-frequency tremors occur, was found newly.
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Report
(4 results)
Research Products
(7 results)
