ASSESSMENT OF EARTHQUAKE SEQUENCE TYPES BY MEANS OF THE APPARENT SEISMIC WAVE AMPLITUDE RATIO VARIANCE
摘要: 本文分析了我国东部地区九个省及其沿海发生的16个不同类型的地震序列,提出用纵、横波的视振幅比方差来判別地震序列类型,特别是判别前震序列的方法。 结果表明,对于视振幅比方差而言,前震序列小于0.25,震群序列在0.26—0.50之间,余震及完整的前—主—余震序列大于0.55,正常的地震活动与震群序列差不多。如果把所有的方差两两组合,相互之间进行F检验,则不同类型的地震序列之间,大部份都存在显著差异,相同类型的地震序列之间,大部份均不存在显著差异。利用得分法进行统计,其准确率在置信水平α=0.05时达85.8%,在α=0.10时达88.3%。Abstract: Having analyzed one by one 16 different earthquakes taking place in nine provinces of eastern China and off their coasts, this paper proposes a method of assessing their sequence types, especially the foreshock sequence by means of the apparent seismic wave amplitude ratio variances of S and P waves.The results are as follows. As far as the apparent seismic wave amplitude ratio variance is concerned, the foreshock sequence is smaller than 0.25; the cluster sequences range between 0.26 and 0.50 and the after-shock sequence as well as the foreshock-major shock-after shock type sequence greater than 0.55. For normal earthquake activity, the variance of apparent seismic wave amplitude ratio is about the same as that of the cluster sequence. If we combine all variances into pairs and make F tests between them, we can find that in most cases, there exist marked discrepancies between the variances of different types of earthquake sequences. On the other hand, no obvious discrepancies between Sequences of the same type have been observed. By means of the method of cumulative scores in statistics, accuracy rate of 85.8% at a confidence level α=0.05 and 88.3% at. α=0.10 have been obtained.
 金严等,辽宁省海城地震前震震源错动方式的一个特点,地球物理学报,19, 3, 1976.
 冯德益,近地震S, P波振幅比异常与地震预报,地球物理学报,17,3,1974.
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