平成13年芸予地震による丘陵造成地の木造住宅瓦屋根被害と地盤の常時微動特性

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This paper presents the relation between roof-tile damage of wooden houses and ground shaking intensity by the 2001 Geiyo earthquake. Roof-tile damage of wooden houses caused by the Geiyo earthquake was surveyed at residential districts in and near the western part of Hiroshima City, Koi-ue, Nishi-Ward, and Ajinadai, Hatsukaiti City. Also questionnaire investigation for housing damage and ground shaking intensity was developed in Kure City and Ajinadai. Furthermore, a micro-tremor measurement technique was employed to investigate ground vibration property. The results are as follows: (1) A larger number of roof-tile damage occurred on the fill ground than on the cut ground. (2) The questionnaire seismic intensity is high on an alluvium ground near hill and on a ridge in Kure city, and on fill on improved hill in Ajinadai. The threshold intensity, in which the roof-tile damage starts to appear, seems between 5.5 and 6.0. (3) A ratio of horizontal spectrum to vertical one based on the micro-tremor measurement is found to have clearly different characteristics between fill and cut. This ground vibration property corresponds to larger roof-tile damage of wooden houses in fill on improved hills.
2004-02-29