2000〜2005年の主な地震による震度曝露人口と住家・人的被害との相関に関する考察

概要

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Recent development of nation-wide networks of seismometers in Japan has enhanced high-density observation of earthquake strong motions. Accordingly, seismic intensity distribution has become available approximately on municipal or denser level. In this study, recent earthquakes in Japan have been compared in terms of the simple measure, PEX (population exposure to seismic intensity), which is evaluated as an aggregation of spatially distributed population exposed to a certain level of seismic intensity. Estimated are 15 events in eight major earthquakes which hit the records of JMA seismic intensity 5.5 or stronger during the period of the year 2000 through 2005. The results clearly demonstrate the combined effects of strong motion distributions and population distributions in each earthquake. Macroscopic assessment models have been statistically developed for estimation of building damage and human casualties. Gross damage over the affected area can be approximately estimated on the basis of PEX and HEX (household exposure to seismic intensity) and related model functions characterizing the controversial nature of the JMA seismic intensity.
2006-08-31