New mechanism of azimuthal anisotropy in the oceanic lithosphere
| Project/Area Number |
25800256
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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 | Kyushu University (2015)
Kyoto University (2013-2014) |
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Principal Investigator |
Shito Azusa 九州大学, 理学(系)研究科(研究院), 研究員 (90376541)
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| Research Collaborator |
FURUMURA Takashi 東京大学, 地震研究所, 教授 (80241404)
ABE Natsue 海洋研究開発機構, 研究員 (80302933)
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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 |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 海洋リソスフェア |
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| Outline of Final Research Achievements |
The seismic velocity of Po/So waves traveling in the the Northwest Pacific are studied. The average velocities of the Po/So waves show clear variations as a function of azimuth. The magnitudes of the anisotropy for Po and So waves velocities are 4 % and 2 %,respectively, which are smaller than the results of previous studies for Pn and Sn waves based on seismic exploration. The fast direction is parallel to the past spreading direction of oceanic crust as estimated from magnetic anomalies, which is roughly consistent with the previous studies. We investigate the mechanism of the azimuthal anisotropy of Po/So wave propagation using a Finite Difference Method (FDM) simulation of seismic wave propagation. As a results, we conclude that the azimuthal anisotropy of Po/So waves are explained by lattice preferred orientation of olivine.
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Report
(4 results)
Research Products
(8 results)
