【摘要】 对2009年7月9日云南姚安6.0级地震应急流动观测获取的强余震记录进行了处理和分析,包括记录的滤波及零漂处理,5.2级、4.7级、4.6级三次强余震的PGA、PGV、PGD及PSV、PSD以及对应的谱烈度(SI)与相对持时(Td)等的计算及其分析。结果表明:这些强余震近场记录的滤波处理对高频成份影响较大,对低频部分影响很小;加速度峰值主频集中在3～17 Hz;速度峰值对应频率大都为1～8 Hz;谱烈度值为1.5～36.6。4.7级地震水平向峰值加速度为825.3 gal,对应的地震烈度为Ⅹ度,采用IMM标准,对应的地震烈度为Ⅷ度;而其90%、70%的相对能量持时和1/5峰值分数持时的长度分别为1.62 s、0.64 s和0.92 s;最大加速度峰值与对应的谱烈度值之比值,亦仅列众强余震的第6位。对此次强震动记录与地震灾害的相关问题进行了讨论。更多还原

【Abstract】 The data gained by emergency mobile strong-motion observation of the aftershock of Yao’an M6.0 earthquake on July 9,2009 are processed and analyzed,including filtering,baseline correction of their acceleration trace,calculation of the PGA,PGV,PGD,PSV,PSD,spectrum intensity(SI) and Td of M5.2,M4.7 and M4.6 aftershocks.The results indicate that filter processing of the near field records of aftershocks evidently affects the high frequency component,but its effect on the low frequency component is little;The main frequency of acceleration concentrates in 3～18 Hz;The main frequency of speed is between 1～8 Hz;Spectrum intensity values are between 1.5～36.6.The horizontal acceleration peak value of M4.7 aftershock is 825.3 gal and the corresponding seismic intensity is Ⅹ;but its IMM is intensity Ⅷ.The 90% and 70% of relative duration of ground motion and 1/5 of peak value dispersion duration respectively are 1.62 s,0.64 s and 0.92 s;The ratio of the maximum acceleration peak value to the corresponding spectrum intensity value is only arranged 6th in the strong aftershocks.The records of strong motion and earthquake damage are discussed.更多还原