Abstract
Recently, many papers and reports on landslides or slope failure have been published. However, we have few useful reports on prediction of landslides or slope failure, because there are many factors relating complicatedly with these phenomena. In some areas, typical cases of landslides are often found. For example, in most of landslides in Amakusa which occurred in area of tertiary sedimentary rocks sliding mass moved along thin clay layer on bed rock. Then, it was tried to draw the hazard map in Amakusa Islands considering slope angle, dip-strike and friction angle, and we got the result that slopes of sedimentary rock could be classified into five ranks in hazard map.
