GIS analysis of landslide in Marumori town, Miyagi prefecture, Japan triggered by heavy rain of typhoon Hagibis

Abstract

Heavy rain by typhoon Hagibis gave many shallow landslides in Marumori Town, Japan. GIS analysis was performed using precipitation, landslide inventory and DEM; as a result, for the three-hour precipitation, landslide area ratio was higher in 200-220 mm than in 180-200 mm and weak peak was confirmed in 80-100 and 120-140 mm, respectively. For slope angle, weak peaks were confirmed but more than 0.03% in the ratio was recorded from 10-45 degree without remarkable peak. For slope aspect, orientation bias of the ratio was confirmed in northwest. For horizontal curvature, the ratio was higher on concave than on convex slope.