Estimation of three-dimensional sliding plane geometry using ground surface displacement data

Abstract

A new approach named polyhedron method is proposed for estimating underground sliding plane geometry by analyzing only ground displacement vectors. The displacement vectors are calculated from three-dimensional positional data of ground points surveyed in the landslide area at different times, and a three-dimensional underground sliding plane geometry is estimated by the polyhedron which consists of triangular surfaces. The proposed method is applied to actual landslide areas of Shin-yasu landslide and Aidoji landslide in Nagano prefecture.