, Many 〔 池 mund pies we 艶 si ... m , ilicantly damaged during the 1995 Hyogoken − Nanbu earthquake , [ [ he results of analysis indieate that the natural period of the buildings which suffered fn } m p 且edama 臼 e , お longer than that ofthe buid洫 gs without p 且e damage. However, after the reconstruction of p 且es , the natural period ten〔 給 tκ) be shor わer than that of buidi皿 gs with damaged piles , and 蛉 曲 o丑ar U) that of bu 曲 ngs 輌 th 〔 aged pies . [ rhese facts show that the damage to the pile

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... foundation can be evaluated fu)m the natural periodofbu 且dmgs basedon microtremor mesurements . Ke7 words : 1995 Hyogoken ・ Nanbu earthquake , pile foundation , damage , microtremor measurementS , natural perk ) d , repair