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根据我国大陆58个Ms≥5级地震的震例资料．详细地研究了地震异常延续有效时间与持续时间的相关关系．给出了由地震异常持续时间计算地震异常预测的有效时间（即地震异常延续有效时间的最优估值）的公式，经多种数理统计方法检验，证明这一公式是可信、可用的.这为进一步深入开展地震异常前兆信息量的研究奠定了基础，同时也为日常地震会商中常需确定地震异常延续有效性问题．提供了定量分析判定依据，因此本研究具有一定的实际意义
According to the earthquake data of 58 Ms≥5 earthquakes in mainland China. The relationship between the effective duration and the duration of the anomalous continuation of an earthquake is studied in detail. The formula for calculating the effective time (ie, the optimal valuation of the effective duration of seismic anomalies) predicted by the anomalous duration of an earthquake is given and verified by various mathematical statistics to prove that the formula is credible and available. This laid the foundation for further research on the amount of earthquake anomalous precursory information and also often required to determine the continuation of validity of seismic anomalies for daily earthquake consultation. Provide basis for quantitative analysis and judgment, so this study has some practical significance