Slip surface layer estimation of shallow landslides on Aso volcanic mountains in Japan based on tephra layer-soil properties

Abstract

Shallow landslides are known to appear frequently on the Aso volcanic mountains. The soil material on the Aso volcanic mountains consists of tephra layers obtained from volcanic activities. This study is aimed at determining the soil property factors that correlate with the slip surface of a shallow landslide on the volcanic mountain area. Tephra layers consist of kuroboku and scoria layers and the differences between these layers have been determined using soil property tests. This study determined that the plasticity index and the fine fraction content can be used as factors showing the slip surface indication in the Aso volcanic area.