Developing A 7.5-sec Site-condition Map For
Japan Based On Geomorphologic Classification
Author(s)
K. Wakamatsu & M. Matsuoka
Abstract
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 30 m–Vs30 is
estimated and mapped for all of Japan. As the other examples of the database’s
application being released by public agencies, presents prefectural seismic risk
analyses, Seismic Hazard Maps for Japan, Quick Estimation System for
Earthquake Maps triggered by observation records (QuiQuake) are presented.
Keywords: GIS database, geomorphologic land classification, seismic hazard
mapping, Vs30, seismic risk analyses.
1 Introduction
A number of ocean-trench earthquakes including the Tokai, Tonankai and
Nankai earthquakes and inland earthquakes hit the Tokyo metropolitan area are
expected to occur with high probabilities in the near future in Japan. Local
ground conditions play important roles in characterizing and assessing their
hazards. However, neither a digital database nor paper maps of ground
conditions throughout Japan had been available in a unified form.
Keywords
GIS database, geomorphologic land classification, seismic hazard
mapping, Vs30, seismic risk analyses
Related Book
Other papers in this volume
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