| Project/Area Number |
15253003
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HIRATA Naoshi The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (90156670)
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| Co-Investigator(Kenkyū-buntansha) |
KANAZAWA Toshihiko The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (30114698)
SHINOHARA Masanao The University of Tokyo, Earthquake Research Institut, Associate Professor, 地震研究所, 助教授 (90242172)
SATO Hiroshi The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (00183385)
IWASAKI Takaya The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (70151719)
KURASHIMO Eiji The University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (00302620)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥39,000,000 (Direct Cost: ¥30,000,000、Indirect Cost: ¥9,000,000)
Fiscal Year 2005: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2004: ¥27,170,000 (Direct Cost: ¥20,900,000、Indirect Cost: ¥6,270,000)
Fiscal Year 2003: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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| Keywords | Taiwan / Collision boundary / Seismotectonics / reflection seismics / Tomography / mountain building / active tectonics / delamination |
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| Research Abstract |
We deployed 60 3-component seismographs along a 150-km-long line in the southern part of Taiwan to observe natural earthquakes in 2005. We have recorded local, regional and teleseismic events. The data show large-scale deformation of the crust, which might be controlled by the collision tectonics in Taiwan. A highly active seismic activity was detected in central part of the east-west line indicating intra seicmic activity.
We analyzed the seismic data that we acquired in 2005 to obtain a two-dimensional seismic velocity structure under the east-west line. The tomogram that we obtained shows a thick crust beneath the central mountains and a high velocity body intruding to a shallower part of the crust.
We integrated the data form the observation of aftershocks of the 1999 Chi-Chi earthquake, those of the 2001 observation in Taiwan, and other geophysical data, which are collected to plan the TAIGER project proposed by the US and Taiwan scientists. We discussed the results in the TAIGER work shop held in Taiwan.
The integrated results indicate that the whole lithospheric collision tectonics is, at least the central and southern part of Taiwan mountain areas, important to understand the mountain building process. The collision tectonics has important implication to the Japanese in-land earthquakes such as the 2004 mid-Niigata prefecture earthquake. We compared earthquakes and tectonics in Taiwan and Japan.
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