Abstract
The Ikutahara landslide, which is located at so-called “Green Tuff” region in northeastern Hokkaido, is the detritus slide type. The slide surface is in the clay with gravels of the middle part of the detritus. It is considered from the mode of occurrence and properties of the clay and the topography of the ancient landslide that the clay of slide horizon is probably a part of that of the ancient landslide. The mode of occurrence and mineral assemblage of the detritus and properties of the clay of slide horizon suggest that the clay of the landslide in 1976 and the ancient landslide in the Ikutahara landslide area had been formed mainly by the slaking of the pelitic rock and the weathering of the acidic igneous rock.
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