JpGU-AGU Joint Meeting 2017

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[JJ] Oral

H (Human Geosciences) » H-DS Disaster geosciences

[H-DS17] [JJ] Geohazards in humid, tectonically active countries and their precursors

Wed. May 24, 2017 1:45 PM - 3:15 PM 102 (International Conference Hall 1F)

convener:Masahiro Chigira(Disaster Prevention Research Institute, Kyoto University), Satoru Kojima(Department of Civil Engineering, Gifu University), Hiroshi YAGI(Faculty of Art, Science and Education, Yamagata University), Taro Uchida(National Institute for Land and Infrastructure Management), Chairperson:Masahiro Chigira(Disaster Prevention Research Institute, Kyoto University), Chairperson:Hiroshi Yagi(Faculty of Art, Science and Education, Yamagata University)

2:30 PM - 2:45 PM

[HDS17-04] Study on landslide-susceptible slopes by heavy rain in the Aso Caldera, Southwest Japan

*Daisuke Higaki1, Xueqiang Li2, Ikuima Hayashi1 (1.Faculty of Agriculture and Life Science, Hirosaki University, 2.Japan Conservation Engineers Co. Ltd.)

Keywords:landslide, tephra , Aso Mountains

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.