11 1993年釧路沖地震および1994年三陸はるか沖地震における住宅被害と表層地盤特性

概要

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In this paper we will discuss a correlation between the earthquake damage distribution and the geological characteristics of the site. We have investigated closely the damages of houses in the cities of Hachinohe and Kushiro caused by following two earthquakes respectively: 1) the 1994 Sanriku-Haruka-Oki Earthquake and 2) the 1993 Kushiro-Oki Earthquake. The emphasis will be put on how the site effects govern the relationship between the damage distribution and the following factors: 1) topographic feature, plateau and alluvial plain, 2) thickness of surface layers, and 3) distribution at the predominant period of the ground. The result of the study will show following correlations: 1) The damages occur on plateau and its near field, but hardly on alluvial plain. 2) The damages are found in the site of a particular thickness (10-20m) of surface layers. 3) The predominant periods in the damage area are 0.3-0.4 sec.
2005-03-20