Journal of the Japan Society of Erosion Control Engineering,
Vol.55,No.6,p.13-20,2003
Major factors causing the landslide in the Chu]fen]erh]shan area induced
by the 921 Chi]Chi earthquake, in Taiwan
Setsuo HAYASHI, Kanji KONDO, Shinya NUMAMOTO, Hiroshi KAWABE, Wen]Neng WANG
Abstract
A large scale landslide occurred in the Chu]fen]erh]shan area at about the same time as the 921 Chi]Chi earthquake, 1999. The landslide had a width of about 1km, length of about 2km, and volume of about 35million m3. The failed slope was made of a dip slope of shale bed 22]27degrees forword southeast. The laying shale bed was of clay 3] to4] cm thick on the slip surface consisted of calcite educed on the clay surface. As the slope profile before the landslide showed a linear concave surface, this profile may be formed by the previous landslide. The previous landslide may also have been caused by an earthquake since the whole site of the landslide showed a convex profile.
Key words:Chi]Chi earthquake, Chu]fen]erh]shan, landslide, previous landslide, shale bed