Abstract
Landslides or slope failures may occur during or immediately after heavy or prolonged rainfall. The amount of rainwater that infiltrates into the slope is one of the most significant triggering factors; in addition, the antecedent moisture content of the soil slope is an important control factor for landslide or slope failure. Hence, the aim of this study is to determine the critical rainfall threshold for an early warning system that can mitigate the loss of life and property. A modified GIS-based Green-Ampt infiltration model and infinite slope stability model were applied to determine the critical rainfall threshold. This study was performed to validate the efficiency of the critical rainfall threshold using the case of the Fukuoka landslide in 2017 by comparing the three-day antecedent precipitation index and the critical rainfall threshold in terms of the rainfall triggered ratio.
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