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中文摘要：
通过对不同断层距的台湾集集地震（1999年）和美国北岭地震（1994年）中强震加速度记录的统计分析和参数拟合,发现速度脉冲出现的频度随断层距的增大而减少的规律比较明显.当断层距大于40 km时,出现速度脉冲的频度很小,速度脉冲的影响通常可以忽略不计.脉冲峰值随断层距增大而衰减的规律也很明显,无论是集集地震还是北岭地震,峰值速度（vg）和速度脉冲的峰值（vp）随距离的衰减总体都是较快的,N-S方向的衰减尤为明显.
英文摘要：
Based on the strong earthquake acceleration records in different fault distances from the Chi-Chi earthquake in Taiwan（1999） and Northridge Earthquake（1994） in the United States,the statistical analysis and parameter fitting are performed.It is obvious that the occurrence of frequency of the speed pulses appearing in ground motion records decreases with increasing fault distances.When the fault distance is more than 40 km,the occurrence of frequency of the velocity impulse is very small.Beyond this range,the effects of speed pulses can be neglected.The attenuation law of pulse peak with increasing fault distances is also observed.Result show that either for Chi-Chi earthquake or Northridge earthquake,the general attenuation of pulse peak（vg and vp） is very fast.
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