ABSTRACT
On 16th April 2016, the Kumamoto earthquake (Mw 7.0) hit the Central Kyushu Region, Japan, following a Mw 6.2 shock on 14th of April. The earthquake sequences caused severe liquefaction in southern Kumamoto City. For the mitigation and preparedness over the liquefaction-induced damage, a study on the prediction of ground subsidence for future earthquake is important. In this study, an attempt was made to extract liquefaction-induced ground subsidence in the affected area from a set of the Digital Surface Models (DSMs) from airborne LiDAR surveys before (2007) and after (2017) the earthquake. The subsidence map is prepared by eliminating deep-seated tectonic displacements and systematic errors using the template matching technique. The liquefaction assessment is carried out by using boreholes and soil test data from Kumamoto City. The extracted values of road subsidence from the DSM indicates that the liquefaction-induced road subsidence is larger for the residential roads than that of the national roads even at the same PL value.
