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海底地震动的等延性强度折减系数谱

DOI: 10.13197/j.eeev.2014.02.1.chenbk.001, PP. 1-11

Keywords: 海底地震动,弹塑性反应谱,强度折减系数,K-NET强震台网,震中距,水深

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Abstract:

为了解海底与陆地地震动弹塑性地震反应谱的差别,本文选取日本K-NET强震台网近年收集的部分海底及陆地强震记录,总计6个海底台站与相邻8个陆地台站在6次地震中的67组(双向水平)强震记录,以统计分析的方法研究了海底台站及其相邻的陆地台站强震记录的等延性强度折减系数谱的特性。进一步选取美国“海底地震动观测系统项目(SEMS)”的7个台站在8次地震中的9组(双向水平)海底强震记录与K-NET海底强震记录的等延性强度折减系数谱进行了对比,以探求震中距、水深等对海底地震动等延性系数强度折减系数谱的影响。总体上看,海底与陆地地震动的等延性强度折减系数谱相差不大,震中距对海底地震动等延性强度折减系数谱有一定影响,特别在周期T<1.5s时,震中距越大其谱值越小,而水深对其影响不大。

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