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研究了近年来我国39个较大地震的余震序列的持续时间的一般特征及其与主震应力降、主震后波速比负异常的关系。提出了以震后波速比由下降变为上升的转折点将余震活动分为早期和晚期两个阶段的看法,并阐述了不同阶段余震的不同活动规律。
The general characteristics of the duration of aftershock sequences of 39 major earthquakes in China and their relationship with the stress drop of the main shock and the negative anomalies of the wave velocity ratio after the main shock are studied. It is put forward that the aftershock activity can be divided into two phases, early and late phases, at the turning point when the wave velocity ratio changes from descending to rising, and the different rules of aftershock activity in different phases are expounded.