Mass Rock Creep of Crystalline Schist (Part 1)

The Relationship between Geologic Structures and Landslide Topographies in the Sambagawa Terrain in the Kanto Mountainous Land

Abstract

Geological and geomorphological invesigation was performed in the Kanto mountainous land to study the relationship between geology and landslide topographies in the Sambagawa terrain where crystalline schist is distributed. Landslide topographies were found to be abundant in pelitic and basic schist ranges and scarce in siliceous schist, psammitic schist, and massive basic rock ranges. It was elucidated that the landslide topographies have the size and the moving direction, both are controlled by the attitude of the basement rocks. The landslide topographies that show the movement about parallel with the dip direction of the basement rocks exceed the other landslide topographies in their number and in their size.