Abstract
It is said that many landslides occurred in specific geological areas where certain geological features, such as rock types, soil properties resulting from weathering and degree of weathering, were found.
In this paper, the authers investigated the relationships between the physical properties of the soil and the frequency of landslides. They also discussed why more landslides occure in higher activity soils in the tertiary strata on Amakusa Island.
Also, the difference of activity was explained by X-ray analysis, ignition loss and specifics surface.
