1992 Fiscal Year Final Research Report Summary
Seismic Reflection Survey across the Median Tectonic Line and its 3-D Structure
| Project/Area Number |
03402017
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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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) |
ASANUMA Toshio Chiba University,Department of Earth Sciences,Research Associate, 理学部, 助手 (50092028)
HIRATA Naoshi Chiba University,Department of Earth Sciences,Associate Professor, 理学部, 助教授 (90156670)
ISEZAKI Nobuhiro Chiba University,Department of Earth Sciences,Professor, 理学部, 教授 (60107943)
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| Project Period (FY) |
1991 – 1992
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| Keywords | median Tectonic Line / Seismic reflection / Gravity / Electric conductivity |
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| Research Abstract |
15.5-Km-long seismic reflection survey was done by two "Vibroseis" machines across the Median Tectonic Line(MTL),east Shikoku,from February to March in 1992.Accompanied with this seismic survey,gravity,magnetotelluric(MT),magnetic surveys were also made along the seismic survey line.The results from the surveys clearly show that MTL dips northward at 30 to 40 degrees from the ground to about 5.5 km deep.The deeper-than-5.5-km part of MTL has not been found in the reflection profile,because signals from the deeper are too weak.Before our survey, most geologists believe that MTL must be vertical from the shallower to deeper. Therefore our results are revolutionary and they require the re-examination of formative process of MTL.
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