災害小特集「東日本大震災以降の主な災害とその対応」
3-③ 地震前後のレーザ地形データ差分解析による阿蘇カルデラ内地表面の大変位の計測
2021 年 60 巻 5 号 p. 248-251
詳細
2021 年 60 巻 5 号 p. 248-251
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.
