地盤不整形性を考慮したマイクロゾーニングに関する研究 : 西宮市を例として

概要

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It is very important to estimate the distribution of seismic intensities for regional earthquake damage prediction about future big earthquake. The seismic intensity is strongly influenced by subsurface ground condition and basement irregular boundary condition. Although we usually estimate the site effect, predominant period and amplification, based on 1-D (one-dimensional) analysis method in order to predict the seismic intensity. Attention is focused on Nishinomiya-city in Hyogo pref., Japan, and the present paper considers the micro-zoning study for seismic intensity. Nishinomiya-city was suffered serious damages and four areas of this city recorded the highest degree in Japanese seismic intensity scale (IJMA=7) in 1995 Hyogo-ken Nanbu Earthquake, Japan. We tried to make two micro zoning maps of seismic intensity distribution in Nishinomiya-city by 1-D and 2-D (two-dimensional) soil response analysis. We compared between these maps and the evaluated seismic intensity distribution by JMA just after the 1995 Hyogo-ken Nanbu Earthquake, and the rate of the razed wooden house.
2001-08-30