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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。
The strong earthquakes records of 32 stations located in the footwall of the fault were selected for the Wenchuan 8.0 earthquake, of which 20 were earth stations and 12 were bedrock stations. First, the one-dimensional equivalent linear method is used to invert the horizontal seismic time history of bedrock from the horizontal seismic records. Then the regression statistical analysis was carried out, and the relationship between the peak acceleration of horizontal ground motion and the attenuation of response spectrum was given. Finally, comparing the obtained results with other attenuation relationships, the obtained attenuation relationship is analyzed to reveal the attenuation characteristics of the underlying bedrock of the Wenchuan earthquake. The attenuation relationship is reasonable and provides a basis for the analysis of Hanyuan intensity anomaly to determine the ground motions data.