摘要
应用Ｓｏｍｐｉ谱分析方法，对１９８９年１月至１９９０年７月发生在唐山地区的２０个地震和１９８８年７月至１９８９年１０月发生在大同周围地区１０个地震波（体波和面波）资料，及华北地区和西南地区自１９５９年以来ＭＬ≥２．０地震目录资料的频谱进行了分析，从而对几次大地震前地震波和地震活动性波频谱异常变化特征进行了研究。所得结果表明：较大地震前，地震波（体波和面波）及地震活动性的ｆｄ，均可能呈现出较明显的下降异常变化；地震波及地震活动性的ｆｄ变化可能成为地震预报的有用指标；
By using the data of digital seismic records and seismicity,anomalous variations of Sompi spectra haved been calculated and analyzed.The results obtained show that before large earthquakes more remarkable decreased type anomalous variations may be discovered in the dominant frequency f d of the spetra of seismic waves and seismicity Therefore,it may become useful index for earthquakes prediction.
出处
《东北地震研究》
1997年第1期9-13,共5页
Seismological Research of Northeast China
