Evaluating earthquake-induced widespread slope failure hazards using an AHP-GIS combination

Masanori Kohno (), Yuki Higuchi and Yusuke Ono
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Masanori Kohno: Tottori University
Yuki Higuchi: Tottori University
Yusuke Ono: Tottori University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 116, issue 2, No 5, 1485-1512

Abstract: Abstract Landslides and slope failures are often caused by earthquakes. This study proposes a method to map earthquake-induced slope failure hazards that uses the analytic hierarchy process (AHP) and a geographic information system (GIS) for four districts where many slope failures were induced by earthquakes (the 2018 Hokkaido Eastern Iburi, 2016 Kumamoto, 2008 Iwate-Miyagi Nairiku, and 2004 Mid Niigata Prefecture earthquakes). The assessment system, which was based on the National Research Institute for Earth Science and Disaster Resilience landslide distribution maps, was analyzed using the methods of previously published. We considered the relationships between the earthquake-induced slope failure distributions and landslide hazard factors (elevation, slope angle, slope type, catchment degree, geology, and vegetation). These relationships were utilized for pairwise comparisons of the factors in the AHP analysis. The slope angle, slope type, and catchment degree exerted the highest effects on the slope failure distribution in the four districts. The four earthquake-induced slope failure distributions were highly consistent with the slope failure hazard rank. These results provide a practical method for evaluating earthquake-induced slope-failure hazards.

Keywords: Earthquake; Slope failure; Topographic primary-cause; Analytic hierarchy process (AHP); Geographic information system (GIS); Hazard map (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-022-05725-w

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