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研究了地震序列的准周期性，提出了预测早期强余震发生时间的准周期性方法及其定量预报指标，同时进行了回溯性预报检验，Ｒ值评分为０４５。表明该方法具有一定的预报效能。
The quasi-periodicity of the earthquake sequence is studied. A quasi-periodic method for predicting the occurrence time of early strong aftershocks and its quantitative forecasting index are proposed. At the same time, a retrospective forecast test is carried out, and the R score is 0.45. It shows that this method has a certain forecast efficiency.