Estimation of coseismic surface displacement in the Aso-Caldera area caused by the 2016 Kumamoto Earthquake, with the Geomorphic Image Analysis using differential LiDAR DEM

• Published in: Journal of the Japan society of photogrammetry and remote sensing Vol. 60; no. 5; pp. 248 - 251
• Main Authors: SATO, Takumi, NISHIMURA, Tomohiro, MUKOYAMA, Sakae
• Format: Journal Article
• Language: English; Japanese
• Published: Tokyo Japan Society of Photogrammetry and Remote Sensing 2021; Japan Science and Technology Agency
• Subjects: Calderas; Diameters; Digital imaging; Displacement; Earthquakes; Geomorphology; Image analysis; Lidar
• ISSN: 0285-5844; 1883-9061
• DOI: 10.4287/jsprs.60.248

After the main shock of 2016 Kumamoto Earthquake (Mj7.3), coseismic wide-area crustal deformation was observed around Aso region in Kumamoto Prefecture, Japan. In this study, multi-temporal LiDAR DEMs and Digital Geomorphic Image Matching method was applied to measure ground displacements of 1m scale in wide-area.As a result, seismic wide-area crustal deformation around caldera and displacements along a lot of surface ruptures of the earthquake faults were observed. Additionally, large lateral slides of the area of 1-2km diameter were observed in the flat caldera floor filled with unconsolidated sediment. Amount of displacements of these area were 1-4m.