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

Abstract

Shallow landslides occur frequently on the Aso volcanic mountains. The soil material on the Aso volcanic mountains consists of tephra layers formed by volcanic activities. This study is aimed at determining the physical properties of soil 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 the physical properties of soil methods. This study showed that the plasticity index and the fine fraction content can be used for estimating the slip layer in the Aso volcanic area.