Abstract
The mountainous district of Higashikubiki is underlain by Neogene marine sedimentary muddy stones, which have substantially reduced strength as a result of folding and severe weathering. In general the clastic formations have been altered to soft clay-rich soils.
Therfore landslides have frequently occurred all around in this district, and are distributed most abundantly, in Japan.
In this paper the author will reported about the relationship between landslide occurrence, geology and, soil composition.