2013 Fiscal Year Final Research Report
Independent component analysis of Australian-wide-array geomagnetic data
| Project/Area Number |
23403004
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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 | 海外学術 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Tohoku University |
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Principal Investigator |
ICHIKI Masahiro 東北大学, 理学(系)研究科(研究院), 助教 (80359182)
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| Co-Investigator(Kenkyū-buntansha) |
SUGA Toshio 東北大学, 大学院・理学研究科, 教授 (70211977)
FUJITA Kiyoshi 大阪大学, 大学院・工学研究科, 教授 (00283862)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 海洋ダイナモ / 電気伝導度構造 / 地磁気変動 / 独立成分分析 / 潮流 |
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| Research Abstract |
Employed the Australian-wide geomagnetic array data, we investigated the mechanism of the outstanding power spectrum density of geomagnetic variation corresponding to M2 tide observed at Alice Springs, central Australia, and estimated 3-D electrical conductivity profile in the uppermantle beneath entire Australian continent after elimination of the tidal effect. A distribution of the large geomagnetic power spectrum density corresponding to M2 tide is consistent with the land surface conductivity distribution rather than periodic current distribution. The upper mantle conductivity model beneath Australian continent clearly revealed the geological terrains, in particular Yilgarn and Pilbara Cratons.
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