Estimation of coseismic deformation of valley fill embankment associated with the 2018 Hokkaido Eastern Iburi Earthquake, based on differential InSAR and differential LiDAR DEM analysis

Abstract

After the main shock of 2018 Hokkaido Eastern Iburi Earthquake (Mj6.7), coseismic ground displacement or deformation was observed around eastern region of Sapporo City in Hokkaido, Japan. In this study, multi-temporal LiDAR DEMs and Digital Geomorphic Image Matching method was applied to measure ground displacements of meter-scale. As a result, local ground displacements and subsidence by lateral flow of valley fill embankment were observed in the developed residential land. These results were consistent with the results estimated by analysis of SAR Images.