Japan Geoscience Union Meeting 2023

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[J] Oral

H (Human Geosciences ) » H-GM Geomorphology

[H-GM02] Geomorphology

Thu. May 25, 2023 9:00 AM - 10:15 AM Exhibition Hall Special Setting (3) (Exhibition Hall 8, Makuhari Messe)

convener:Hitoshi SAITO(Graduate School of Environmental Studies, Nagoya University), Junko Iwahashi(GSI of Japan), Thomas Parkner(University of Tsukuba, Faculty of Life and Environmental Sciences), Shintaro Takanami(Meiji University), Chairperson:Junko Iwahashi(GSI of Japan), Shintaro Takanami(Meiji University), Hitoshi SAITO(Graduate School of Environmental Studies, Nagoya University)


10:00 AM - 10:15 AM

[HGM02-05] Influence of DEM sources on estimation of earthquake-induced landslides using slope

*Junko Iwahashi1, Ryo Endo1 (1.GSI of Japan)

Keywords:DEM, Landslide, Earthquake-induced landslide, Landslide inventory, PR-AUC

It is well known that small topography contributes significantly to the occurrence of earthquake-induced landslides. Simple estimation methods that use geospatial information include the Rokko formula (Uchida et al., 2004), which uses slope and curvature and peak ground acceleration (PGA), and its improved version, the modified Rokko formula (Kamiya et al., 2012). Generally, a digital elevation model (DEM), which is the gridded elevation data, is used to calculate slope and curvature. However, it is well known that the values of topographic quantities such as slope vary depending on the quality and grid spacing of the DEM source data (the so-called scale issue of DEM). In this study, using the GSI's national DEM, which is a nationwide DEM open to the public, we examined the collapse hazards of the modified Rokko formula obtained from DEM10B and the 10-m DEM , which incorporates DEM5A and other data, was quantitatively verified against inventory maps of landslides that occurred during actual earthquakes.