1993 Fiscal Year Final Research Report Summary
RELATIONS BETWEEN LARGE-SCALE PREHISTORIC LANDSLIDE AND PREZENTLY ACTIVE LANDSLIDE
| Project/Area Number |
03455010
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
TAKAHAMA Nobuyuki NIIGATA UNIV., RES.INST.FOR HAZARDS., ASSOCIATE PROFESSOR, 積雪地域災害研究センター, 助教授 (20018948)
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| Co-Investigator(Kenkyū-buntansha) |
UDA Tsuyoshi NIIGATA UNIV., FAC.SCIENCE, LECTURER, 理学部, 講師 (80134914)
HAYAKAWA Kaichi NIIGATA UNIV., FAC.AGRICULTURE, ASSISTANT, 農学部, 助手 (10018541)
YOSHIDA Shoji NIIGATA UNIV., FAC.AGRICULTURE, PROFESSOR, 農学部, 教授 (80018530)
MARUI Hideaki NIIGATA UNIV., RES.INST.FOR HAZARDS., ASSOCIATE PROFESSOR, 積雪地域災害研究センター, 助教授 (10219545)
OKI Yasue NIIGATA UNIV., RES.INST.FOR HAZARDS., PROFESSOR, 積雪地域災害研究センター, 教授 (30223754)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Large-scale landslide / Primary landslide / Ancient landslide / Secondary landslide / Active landslide |
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| Research Abstract |
Most of the presently active landslides in the Japanese Islands occur in the ancient landslides due to reactivation of slide mass. This viewpoint has been confirmed by many researchers and it is an original theory generated in Japan, concerning with the present landslide activity. But, the research of this problem is not advancement, and this theory has not been put to practical use for the prediction and countermeasure works against landslide disasters.
We have invesigated above problem at Higashinomyo landslide site as a case study. The present Hifashinomyo landslide, which began about 200 years before, is a particl reactivation (secondary landslide) in an ancient primary slide mass which was formed before about 50 thousands years in the Late Pleistocene. The present slide movement has multiple slip surface layrs. The shallow movement in the coluvium of the Miocene marine mudstone, is intermittent activity at intervals of several years.
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