Japan is a country of many geological hazards, including volcanic activity, earthquakes, and landslides. Of these, landslides triggered by heavy rainfall tend to occur during the yearly rainy season from early June through the middle of July. Sasebo City, located in the northwest part of Kyushu Island, is one of the most landslide-prone places in Japan. Results of a series of investigations done to establish an outline of a landslide and its causes are reported. This information provides some important factors in disaster prevention for the Hokusho-type of landslide. The landslide described here is a typical, secondary sliding Hokusho-type, the result of erosion caused by rainfall on weak strata. It occurred on a gentle, concave hillslope, on which both surface and ground water tend to concentrate. On the basis of its characteristics, the main causes and mechanism of this landslide is described and some lessons learned discussed. Constructive proposals and countermeasures to be taken to prevent the occurrence of landslides, which are based mainly on an effective drainage system are considered.
雑誌名
Journal of natural disaster science
巻
20
号
2
ページ
67 - 74
発行年
1998
出版者
日本自然災害学会
ISSN
03884090
書誌レコードID
AA10898116
権利
日本自然災害学会
本文データは学協会の許諾に基づきCiNiiから複製したものである
著者版フラグ
publisher
引用
Journal of natural disaster science. 1998, 20(2), p.67-74
The July 1997 Landslide Disaster at Harubun, Sasebo, Japan
jNDS20_2_67.pdf
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