On the distinction between the landslide and the landslide, there is no defi, nited theory in our country, yet.
Generally, in case of the landslide, clay substances invitate the landslide movement.
There are many landslide districts in Niigata Pref. Above all, landslide frequently occurs in Gendozi district, Nakakubigun.
The geology in this district consists of the Teradomari formation and its chief is black shale, and combine the tuffaceous clay and sandy beds.
The result of studies on the habits of tuffaceous clay using X-ray analysis, chemical analysis and colouring method, the fact is cleared up that this is the bentonitic clay containing montmorillonite as chief clay mineral.
Consequently, I guessed montmorillonite was swelled by ground water and underground water and the bed became unstable to cause the landslide.
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