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Summary

This study analyzes the morphometry of relic landslides in four mountainous areas in Japan. Using detailed landslide maps issued by the National Research Institute for Earth Science and Disaster Prevention of Japan, the mobility of 338 relic landslides was evaluated based on the H/L ratio, i.e., the equivalent coefficient of friction. The results of this study imply that morphometric analysis of relic landslides around an unstable 24 mass allows for forecasting of travel distance of the unstable mass.