| Project/Area Number |
15540438
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Kochi University |
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Principal Investigator |
YOKOYAMA Shunji Kochi University, Faculty of Science, professor, 理学部, 教授 (20325400)
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| Co-Investigator(Kenkyū-buntansha) |
SHIOTA Tsugio Kochi University, Faculty of Integrated Arts and Sciences, professor, 総合科学部, 教授 (90035337)
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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 |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Hiroshi Koide / Landslide in Japan / fracture zone landslide / fracture zone / Sambagawa metamorphic belt / collapse of slide type / gravitational creep tilting / Azue fracture zone landslide / 岩盤クリープ / 蛇紋岩 / 緑色岩 / 黒瀬川帯 / 結晶片岩 / 小出 博 / 谷側への曲げ褶曲 |
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| Research Abstract |
Fracture zone landslide defined by Koide(1955) is a collapse of slide type which has features that the landslide moving body breaks into debris, the mass of debris falls down on mountain slope, and it often dames up stream of river. Fracture zone defined by Koide(1955) is a zone of crushed rocks characterized by fractures with a polished and slicked surface. However Koide asserted fault gouge consisting of fault clay and fault breccia to posses no requirement necessary for fracture zone. Many of the fracture zones named after Koide run through in accretionary complex. Fractured rocks satisfying the criterion of recognition for fracture zone are fractured serpentinite, fractured greenstone and pelitic merlage fractured along a polished scaly cleavage.
Among many geologists and geo-technicians it has been seemed that landslides in the Sambagawa metamorphic belt are typical of the fracture zone landslide, but they are not a collapse of slide type but a slow moving and repeating landslide. Fractured rocks occurred in the Yoshino river-Kino river fracture zone and the Mikabu fracture zone are not tectonic origin but non-tectonic origin due to gravitational creep tilting.
This paper made clear that large-scaled collapse caused by heavy rainfall of the No. 10 typhoon in 2004 at Azue, Naka-cho, Tokushima Prefecture is atypical fracture zone landslide occurred in fractured greenstone.
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