2005 Fiscal Year Final Research Report Summary
Study on structure of fracture zone and landslide structure of fracture zone landslide in the Sambagawa metamorphic belt, Shikoku
| 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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| 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 |
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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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[Journal Article] Landslide in tuff of the Kobe Group2005
Author(s)
Yokoyama, S., Mirai, M., Katoh, Y, Tani, Y., Fujita, T.
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Journal Title
Excursion Guidebook, 112^<th> Annual Meeting of Geol.Soci.Japan
Pages: 113-130
Description
「研究成果報告書概要(欧文)」より
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