2003 Fiscal Year Final Research Report Summary
Deep structure of the Median Tectonic Line revealed by an integrated seismic profiling across the Seto Inland Sea
| Project/Area Number |
14204048
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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 | 一般 |
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| Research Field |
Geology
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| Research Institution | Chiba University |
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Principal Investigator |
ITO Tanio Chiba University, Department of Earth Sciences, Professor, 理学部, 教授 (50111448)
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| Co-Investigator(Kenkyū-buntansha) |
TSUMURA Noriko Chiba University, Department of Earth Sciences, Research Associate, 理学部, 助手 (00272302)
MIYAUCHI Takahiro Chiba University, Department of Earth Sciences, Associate Professor, 理学部, 助教授 (00212241)
KANAGAWA Kyuichi Chiba University, Department of Earth Sciences, Associate Professor, 理学部, 助教授 (40185898)
YAMAKITA Satoshi Miyazaki University, Faculty of Education and Culture, Associate Professor, 教育文化学部, 助教授 (80210342)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Seto-Shikoku profile / Southwest Japan / Median Tectonic Line / seismic profiling / Philippine Sea Plate / lower crust / Aki fault |
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| Research Abstract |
Trans-Seto and Shikoku seismic reflection profiling was made as a joint expedition of ERI, JAMSTEC and our research group based on this grant, the end of August, 2002. The deep crustal structure was indicated in an integrated profile of single-fold profiles. Significant results are summarized as follows :
1.The subducting Philippine Sea plate (PHS) is clearly recognized as a combination of reflective layers 1+2 and transparent layer 3.
2.The lower crust of the Japanese island arc is gently dipping southward and comes into contact with the PHS beneath the middle Shikoku.
3.The Median Tectonic Line (MTL) is dipping at about 30 degrees and merges into the lower crust beneath the Seto Inland Sea.
4.Major boundary faults, the Butsuzo Tectonic Line (BTL) and the Aki fault (AF) in the accretionary complexes are dipping northward and merges into the lower crust beneath the Seto Inland Sea.
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[Publications] Suzuki, K., Kawamura, T., Echigo, T., Iwasaki, T., Hirata, N., Sato, H., Miyauchi, T., Ito, T., Ikawa, T.: "Shallow structure of the Tokachi basin revealed by a seismic refraction experiment with dense receiver array, Hokkaido, Japan."Bulletin of the Earthquake Research Institute, University of Tokyo. 77. 131-138 (2002)
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