2003 Volume 55 Issue 6 Pages 13-20
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 l km, length of about 2km, and volume of about 35 million m3. The failed slope was made of a dip slope of shale bed 22-27 degrees forword southeast. The laying shale bed was of clay 3- to 4- 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.