| Project/Area Number |
25400454
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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 | Okayama University |
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Principal Investigator |
Oda Hitoshi 岡山大学, 自然科学研究科, 名誉教授 (50127552)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | S波偏向異方性 / Ps 変換波 / P波レシーバ関数 / 地殻 / マントルウエッジ / Ps変換波 / 地震波減衰 / 西南日本 / S波スプリッティング / レシーバ関数 / 沈み込み帯 |
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| Outline of Final Research Achievements |
We investigate the regional variation of the S-wave polarization anisotropy within the upper and lower crusts and the mantle wedge beneath southwest and northeast Japan from the Ps-converted waves which originate at the Conrad and Moho discontinuities and at the upper plane of subducting oceanic plates. Three similarities are found between the S-wave anisotropic structures estimated in southwest and northeast Japan. The first is that the anisotropic property is different between the upper and lower crusts, the second is that the upper crustal anisotropy is closely correlated to the tectonic stress fields acting on the Japan Islands, and the third is that the lower crustal anisotropy is significantly influenced by the subducting oceanic plates. Additionally, in the Tohoku district, the fast polarization directions show basically N-S and E-W direction trends in the fore-arc and back-arc sides of the mantle wedge, respectively.
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