2013 Fiscal Year Final Research Report
Three dimensional electrical conductivity distribution of the upper mantle around slab and mantle plume
| Project/Area Number |
23740346
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
TADA Noriko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 技術研究副主任 (00509713)
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| Project Period (FY) |
2011 – 2013
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| Keywords | マグネトテルリック法 / 海底電磁気データ / 三次元インバージョン / 三次元電気伝導度構造 / 海洋上部マントル / フィリピン海 / ソサエティー・ホットスポット |
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| Research Abstract |
We revealed the three-dimensional electrical conductivity structure in the upper mantle beneath the Philippine Sea by applying seafloor electromagnetic data to the three-dimensional marine magnetotelluric inversion scheme. We also discussed the importance of incorporating topography around observation sites and choosing a proper initial model. The estimated electrical conductivity structure was verified by resolution and sensitivity tests.
We analyzed seafloor electromagnetic data obtained around the Society hotspot in French Polynesia, and found the conductivity anomaly elongating from the mantle transition zone to the uppermost mantle just below the hotspot.
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