New active fault map based on precise interpretation of aerial photograph and GIS data set of fault parameters

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Following high demand on detailed information for active faults in Japan after the 1995 Hyogoken-namnbu earthquake, we compiled completely new active faults map of Japan with a scale of 1 : 25,000 based on precise interpretation of aerial photographs.We assembled active faults about 140 groups based on the following criteria ; 1.faults more than 10km long in dimension, 2. Isolated from the neighboring faults at least 5km apart, and similar type of faulting, strike and sense of faulting. We also digitized location of active fault traces and their parameters such as displacement, fault reference etc. to GIS data set.We prepared maps for type, activity, and density of faulting to known the regional characteristic of active faulting in Japan. We also examined the possibility of occurrence of new active faults and expansion of faults based on the mode of cumulative slip distribution along their traces.This digital fault map differs much in accuracy from "Active fault in Japan : Sheet map (1 : 200,000) and inventories" and may provide with useful information to geoscientists and engineers for their purposes.