1997 Fiscal Year Final Research Report Summary
DEVELOPMENT OF NORTHERN FOSSA MAGNA AND ACTIVE TECTONICS
| Project/Area Number |
08404025
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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 |
固体地球物理学
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| Research Institution | University of Tokyo |
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Principal Investigator |
HIRATA Naoshi UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,ASSOCIATE PROFESSOR, 地震研究所, 助教授 (90156670)
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| Co-Investigator(Kenkyū-buntansha) |
OKUBO Shuhei UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,PROFESSOR, 地震研究所, 教授 (30152078)
YOSHII Toshikatsu UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,PROFESSOR, 地震研究所, 教授 (40012950)
SAKAI Shinichi UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,ASSISTANT, 地震研究所, 助手 (00251455)
SATO Hiroshi UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,ASSOCIATE PROFESSOR, 地震研究所, 助教授 (00183385)
IWASAKI Takaya UNIVERSITY OF TOKYO,EARTHQUAKE RESEARCH INSTITUTE,ASSOCIATE PROFESSOR, 地震研究所, 助教授 (70151719)
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| Project Period (FY) |
1995 – 1997
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| Keywords | ACTIVE TECTONICS / REFLECTION SEISMIC SURVEY / INVERSION TECTONICS / NORTHERN FOSSA MAGNA / ITOIGAWA-SHIZUOKA TECTONICLINE / COMMON MID POINT METHOD / CONTROLLED SEISMIC EXPERIMENT / MORPHOTECTONICS |
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| Research Abstract |
A deep structure of the Northern Fossa Magna was studied by using a common mid point (CMP) reflection method. A 17-km CMP line covered an active fault named the Itoigawa-Shizuoka Tectonic Line (ISTL). Four vibrators were used to generate seismic waves penetrating at a depth of 5 km. The seismic cross section we obtained reveals that ISTL is an eastward down-dipping fault. Combining the surface geological observation of the active fault and morphotectonics, the ISTL is now thrusting upward to west. The observation supports the idea that an inversion tectonics undergoes at the ISTL as an active tectonics.
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