2014 Fiscal Year Final Research Report
Relationship between temperature distributions and material circulation associated with subduction of oceanic plates and seismological detailed structures beneath the Japanese Islands
| Project/Area Number |
22340126
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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 | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Kobe University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Junichi 東北大学, 理学(系)研究科(研究員), 准教授 (30361067)
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| Project Period (FY) |
2010-04-01 – 2015-03-31
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| Keywords | 温度構造 / 地殻熱流量 / 熱対流モデル / 西南日本 / 関東地方 / 地震波減衰 / 蛇紋岩 / 脱水 |
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| Outline of Final Research Achievements |
Using Hi-net borehole data, we showed that heat flow values are high and low in the uplifted and subsided regions, respectively, in southwest Japan. Constructing a 2D box-type thermal convection model, such heat flow distribution can be explained by the effects of frictional heating on the plate interface and temperature increase and decrease due to erosion and sedimentation, respectively. Developing a 2D box-type thermal convection model with subduction of two oceanic plates simultaneously, we elucidated that low heat flow in the Kanto district can be brought by subduction of the cold Philippine Sea plate.
Using seismic waveforms obtained by nationwide seismic network in Japan, we estimated a 3D attenuation structure for P-waves in the Kyushu district. Based on the results, we concluded that fore arc mantle wedge is serpentinized, and high attenuation areas are distributed in the back arc mantle wedge.
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| Free Research Field |
固体地球惑星物理学
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