Morphometric analysis of landslides based on landslide maps.
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- MORIWAKI Hiromu
- National Research Institute for Earth Science and Disaster Prevention
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- HATTANJI Tsuyoshi
- Graduate School of Geoscience, University of Tsukuba
Bibliographic Information
- Other Title
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- 5万分の1地すべり地形分布図を用いた地すべり地形解析
- 5マンブン ノ 1 ヂスベリ チケイ ブンプズ オ モチイタ ヂスベリ チケイ カイセキ
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Description
We morphometrically studied landslide features and mobility using 1: 50, 000-scale landslide maps issued by the National Research Institute for Earth Science and Disaster Prevention (NIED) of Japan. We selected 3 study areas 19 x 22 km each-the Hachimantai area composed of Quaternary volcanic rock, the Kiyokawa area of Tertiary sedimentary rock, and the Ichinose area of crystalline schist. We found that the number of landslides and slide directions were strongly regulated by geological structures in Tertiary sedimentary rock and crystalline schist. At all 3 locations, most landslide masses were longer and narrower than their source areas. In the Kiyokawa area, however, half of the number of landslidemasses were wider than their source areas . We characterized ranges of the slope angle of source areas and the equivalent coefficient offriction H/L of landslide masses as an index of landslide mobility in each test area, where L is the horizontal distance and H is the relative landslide height . H/L proved to be proportional to the slope tangent of the source area at all locations . The large surface displacement of almost all landslides exceeded the critical strain to slide, indicating that almost all landslides collapsed and slid. Our data should prove useful in predicting and mitigating landslide disasters, and further analysis of wider areas should yield even more practical information
Journal
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- Landslides
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Landslides 39 (2), 244-252, 2002
The Japan Landslide Society
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Keywords
Details 詳細情報について
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- CRID
- 1390001204545932800
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- NII Article ID
- 10010411553
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- NII Book ID
- AN00332562
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- ISSN
- 18843956
- 02852926
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- NDL BIB ID
- 6358477
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed