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本文从点的一维随机分布出发,导出了参数S_1值,用其表示点的时间分布与随机分布相背离的程度,从而提出表征地震活动时序特征的一种方法.在研究华北地区发生的5次Ms≥5.8级地震时,发现震前二年到震前几个月,S_1值有一个明显的上升过程,表明地震前小地震在时间分布上相对于随机分布有明显的集中过程.最后,对S_1值进行了讨论.
Based on the one-dimensional random distribution of points, we derive the parameter S_1, which is used to express the deviation of the time distribution and random distribution of the point, so as to propose a method to characterize the seismic activity sequence features. During Ms≥5.8 earthquakes, it is found that the S_1 value has a clear ascending process in the two years before the earthquake and before the earthquake, indicating that the time distribution of the small earthquakes before earthquakes has obvious concentration process relative to the random distribution.Finally, S_1 values are discussed.