Landslide Susceptibility Assessment in the Japanese Archipelago Based on a Landslide Distribution Map

Though danger prediction and countermeasures for landslides are important, it is fundamentally difficult to take preventive measures in all areas susceptible dangerous landslides. Therefore, necessary perform landslide susceptibility mapping, extract slopes with high hazard/risk, prioritize locations conducting investigations countermeasures. In this study, mapping along the whole slope of Japanese archipelago was performed using analytical hierarchy process (AHP) method, geographic information system analysis conducted that had same level hazard/risk as where occurred past, based on ancient topography archipelago. The evaluation factors used were elevation, angle, type, flow accumulation, geology, vegetation. evaluated score accumulation from AHP method these factors. Based (I V), a map prepared, assessment identified. obtained showed good correspondence distribution, correlated well past occurrences. This suggests our can be applied extraction unstable slopes, effective prioritizing implementing preventative measures.