[H-DS17] [JJ] 湿潤変動帯の地質災害とその前兆

[HDS17-04] 阿蘇山における豪雨による崩壊危険斜面の検討

*檜垣 大助¹、李 学強²、林 郁真¹ (1.国立大学法人弘前大学農学生命科学部、2.国土防災技術㈱)

キーワード：斜面崩壊、火山灰、阿蘇山

The Aso Caldera located in Kyushu, Southwest Japan has been affected by concentrated occurrences of surfacial landslides in the tephra layers in the recent decade. This study aims to propose the detection of slopes with landside susceptibility by heavy rain based on interpretation of LiDAR-based high-resolution topographical maps. Remnants of past landslides are widely distributed on the tephra-covered slopes. Analysis on the locations of recent landslide occurrence indicates that surrounding slopes of remnants of surficial landslides and steep valley side slopes are prone to landslides by heavy rain. Inside of past landslide slopes partially covererd with collapsed materials also may become susceptible after time of tephra deposition.