Development a geomorphologic-based 7.5-seccond site-condition map for Nationwide Hazard Zonings

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In a seismic hazard assessment, local geologic and ground conditions play important roles in characterizing and estimating hazards. The authors created a systematically standardized GIS-based ground-condition map containing the attributes of geomorphologic classification in grid cells of 7.5 arc-seconds latitude×11.25 arc-seconds longitude for all of Japan. This paper introduces the concept of developing the 7.5 arc-second JEGM, and presents sample images of the JEGM. As an example of the database's application to estimating the hazards-the average shear velocity of the ground in the upper 30m-Vs30 is estimated and mapped for all of Japan. As the other examples of the database's application being released by public agencies, prefectural seismic risk analyses, Seismic Hazard Maps for Japan, Quick Estimation System(QuiQuake)for Earthquake Maps triggered by observation records are presented.

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