Distribution and Mobility of Coseismic Landslides Triggered by the 2018 Hokkaido Earthquake in Japan

At 3:08 on 6 September 2018 (UTC +9), massive landslides were triggered by an earthquake of Mw 6.6 that occurred in Hokkaido, Japan. In this paper, a coseismic landslide inventory covers 388 km2 the earthquake-impacted area and includes 5828 with total 23.66 was compiled using visual interpretations various high-resolution satellite images. To analyze spatial distribution characteristics landslides, five factors considered: peak ground acceleration (PGA), elevation, slope gradient, aspect, lithology. Results show more than 87% at 100 to 200 m elevations. Slopes range 10~20°are most susceptible failure. The density places (PGA) greater 0.16 g is obviously larger those PGA less 0.02 g. Compared number scale caused other strong earthquakes mobility Haiyan Wenchuan earthquakes, it found extremely dense Hokkaido weaker Haiyuan earthquake, described following relationship: L = 18.454 ∗ H0.612. Comparative analysis similar magnitude has important guiding significance for disaster prevention reduction reconstruction planning affected areas.