Abstract
　It is now possible because of accumulation of aerial photographs over 30 years in Japan to discuss precisely the geomorphic features and geological background of landslides with help of photo-interpretation. Distinction of characteristics of landform associated with landcreep including slump, debris-mud flow, and surface slide seems important even in this method. Especially when initiation of large landslide is concerned, it is reasonable to emphasize the geologic structure as one of the important controlling factors of the phenomenon. Some of large landslides in the Kii Peninsula, Kinki District, Japan, have occurred on the slopes shaped parallel to stratification of Mesozoic sedimentary rocks which are inclined moderately in this area. Secondary creep or slump of the soil delivered by the initial slide has been observed rather frequently here. Therefore, it can be the first step for prediction of the secondary mass movement to know the distribution of the soil masses which are usually cultivated or populated in this mountainous area. Mapping of the soil-mass distribution seems quite possible based on photo-interpretation, and it is appreciated to start the mapping now, as we have precise topographic maps and accumulated aerial photographs of the area.

*大阪市立大学　地理学教室
Department of Geography, Osaka City University