Journal of the Japan Society of Erosion Control Engineering, Vol.70, No.3, 2017

Analyses of heavy rain event triggering slope failures in Minamiaso]Village, Kumamoto Prefecture, after the2016Kumamoto Earthquake

Nozomu TAKADA, Mitsuhide TOMOMURA, Daisaku SAKAI, Ryoichi WATANABE and Ken'ichirou KOSUGI

This study investigated heavy rain event which triggered slope failures in Minamiaso]Village, Kumamoto Prefecture after the 2016 Kumamoto earthquake, by using antecedent precipitation indices (APIs) with various half]life times(HLTs). The snake lines for this event did not exceed critical lines (CLs) defined as the past]maximal values. When CLs were reduced by 0.7 times, excesses of the snake lines were detected for many combinations of HLTs. Thus, this study clearly indicated increases in slope failure vulnerabilities in the region which suffered from the 2016 Kumamoto Earthquake.

Key wordsFearthquakes, slope failure, antecedent precipitation index, warning system


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