地脉动及特殊波形的频谱特性在地震预报中的应用

利用功率谱和Ｓｏｍｐｉ谱分析方法，对大震前地脉动及震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震前特殊波形频谱的峰值频率ｆｍ，拐角频率ｆｃ相对频带宽度△ｆ相对峰值Ｓｍ／Ｓ０，高频段的斜率绝对值│ｂ│及Ｓｏｍｐｉ谱的卓越频率ｆｄ等特征量均可能出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）

SPECTRAL CHARACTERISTICS OF MICROSEISMS AND SPECIAL WAVEFORMS AND ITS APPLICATION IN EARTHQUAKE PREDICTION

By using the methods of the power spectral analysis and Sompi spectral analysis,the authors have studied the short-period microseism wave form and some special wave-forms before some large earthquakes,and the results show that =before larger earthquakes,the peak frequency,corner frequency,relative width of frequency domain,relative value ofpeak spectrum,the absolute slope value of high frequencies and Sompi spectral frequencymay decrease (some may increase). So,some of them may be used as an important indexfor earthquake prediction.