地震记录图的各种震相和到时的分析,只能得到地震波传播的运动学特征。如果用富里埃变换把时间域的地震记录转换到频率域上,对所得波谱的适当分析可估算描述地震动力学特征的参数。1984年5月21日南黄海发生6.2级地震后,一个月内上海电信传输地震台网共记录到大小余震五百多个。如何从这些地震记录中提取更多的有用信息, Seismic records of the various phases and the arrival of the analysis, can only get the kinematic characteristics of seismic waves. If the time domain seismograms are converted to frequency domain using the Fourier transform, a suitable analysis of the resulting spectrum can estimate the parameters describing the seismic dynamics. On May 21, 1984, a magnitude 6.2 aftershock was recorded by Shanghai Telecommunication Transmission Seismograph Network within a month after the magnitude 6.2 earthquake in the South Yellow Sea. How to extract more useful information from these seismograms,