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利用功率谱和Sompi港分析方法，对大震前地脉动及展前特殊波形等记录进行了比较深入的研究，结果表明；①较大地震前短周期地脉动及展前特殊波形频谱的峰值频率几，拐角频率人，相对频带宽度f，相对峰值人Sm／So，高频段的斜率绝对值问及Sompi港的卓越频率入等特征量均可能呈现出较明显的下降（少数为上升）异常变化；②各频谱特征量呈现异常的时间基本上同步，并与波速异常发展趋势基本相符；③以上异常变化可能反映震前孕震区地下微破裂的形成与发展过程；④地脉动特征量可能为地震中长期及短临预报的研究提供一些有用的信息，有广泛的应用前景。
The power spectrum and the Sompi port analysis method are used to study the pulsation before the earthquake and the pre-show special waveforms. The results show that: ① The short-period pre-earthquake pulsation and the pre-show special waveform spectrum’s peak frequency Few, corner frequency people, relative frequency bandwidth f, relative peak Sm / So, slope absolute value of high frequency band, and Sompi port excellent frequency into the other characteristics may show a significant decline (a few rise) abnormal changes ; ②the time when the spectral features are abnormal is basically synchronous and basically consistent with the development trend of anomalous wave velocity; ③the above anomalies may reflect the formation and development of underground micro-ruptures in the seismogenic zone before the earthquake; ④The characteristics of ground-pulsation may be The study of mid-long term and short-term earthquake prediction provides some useful information and has a wide range of application prospects.