2002 Fiscal Year Final Research Report Summary
Study on stresss concentration mechanism on active faults
| Project/Area Number |
11440128
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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 |
固体地球物理学
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| Research Institution | Tohoku University |
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Principal Investigator |
HASEGAWA Akira Tohoku University,Graduate School of Science,Professor, 大学院・理学研究科, 教授 (40004460)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Tomomi Tohoku University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (30281968)
MATSUZAWA Toru University of Tokyo, Earthquake Research Institute, Associate professor, 地震研究所, 助教授 (20190449)
UMINO Norihito Tohoku University, Craduate School of Sciencce, Associate professor, 大学院・理学研究科, 助教授 (30004477)
DAPENG Zhao Ehime University, Geodynamics Research Center, Professor, 地球深部ダイナミクス研究センター, 教授 (70304665)
MATSUMOTO Satoshi Kyushu University, Graduate School of Science, Associate professor, 大学院・理学研究科, 助教授 (40221593)
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| Project Period (FY) |
1999 – 2002
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| Keywords | Active faults / Seismic tomography / Bright spot / Inland earthquakes / Seismic scatterer / Crustal structure / Fluids / Thermal structure |
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| Research Abstract |
We have performed a detailed investigation on inhomogeneous structure of the crust around active faults aiming to improve our understanding of stress concentration mechanism on active faults. Moreover, we have investigated focal mechanisms and source processes of events occurring along active faults.
Seismic tomography studies revealed a partial melting zone extensively distributed beneath the Moho along the volcanic front. GPS observations show that a zone of large ocontraction deformation in the plate conversion direction is distributed also along the volcanic front. Large earthquake focal areas are distributed aroud this large contraction deformation zone. These observations suggest that fluids in the crust play an important role in the deformation process of the arc crust and in the earthquake generation within it.
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