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汶川8.0级地震断层下盘基岩衰减关系分析

DOI: 10.13577/j.jnd.2015.0205, PP. 32-39

Keywords: 汶川地震,断层下盘,地震动衰减,回归分析

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Abstract:

选取汶川8.0级特大地震位于断层下盘中的32个台站的强震记录,其中20个为土层台,12个为基岩台.首先,利用一维等效线性方法从土层台水平向强震记录反演出基岩水平向地震时程.随后进行了回归统计分析,给出了此次地震的下盘基岩水平向地震动峰值加速度和反应谱衰减关系.最后将所得结果与其他衰减关系对比分析,通过分析得出所得衰减关系揭示了汶川地震的下盘基岩衰减特性,该衰减关系是合理的,为分析汉源烈度异常确定输入地震动提供了基础数据.

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