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收集整理了2013年吉林前郭Ms5.8级震群的地表强地震动记录,进行了常规处理,剔除了异常记录,分析了峰值加速度的分布特征。计算了正常记录的加速度反应谱,采用最小二乘法,统计给出了吉林西部地区土层地表水平向和垂直向20个周期点的加速度反应谱衰减关系,对比分析了地震动的衰减特性,并用震害调查结果检验了峰值加速度衰减关系。结果表明:所得到的吉林西部地区土层地表衰减关系明显低于中国东部的地震动衰减关系。
The ground motion records of strong earthquakes in Ms5.8 of Qianqiang, Jilin Province in 2013 were collected and processed. The records of abnormal records were removed and the distribution of peak accelerations was analyzed. The normal recorded acceleration response spectrum was calculated. The attenuation response of the acceleration response spectrum at horizontal and vertical directions of the earth’s surface in the west of Jilin Province was plotted by the least square method. The attenuation characteristics of ground motion were compared and analyzed. The earthquake damage investigation examined the peak acceleration attenuation relationship. The results show that the relationship between the surface attenuation and the ground motion attenuation in the western Jilin is obviously lower than that in the eastern China.