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本文在文献[2]的基础上,进一步证实了华北地区单位面积中的地震次数K的频数分布服从幂函数关系:N(K)=A/(1+K)~c,K=0,1,2,……K_(max),这里N(K)为所取区域中含有K次地震的单位面积数。等式中的C值表征了地震在空间分布上的集中程度,称之为地震空间集中度。文中研究了1970—1983间华北地区共发生的九次M_S≥5.8级地震震例,发现震前在震中周围较大范围内的C值都有一个明显的异常上升过程,表明较大地震前中小地震在空间上的集中过程是明显的。文章还就C值变化与实际地震空间分布的关系,C值的物理意义、C值的四种估计方法及其优劣、C值的统计分布等问题进行了讨论。
Based on the literature [2], this paper further confirms that the frequency distribution of earthquake frequency K per unit area in North China follows the power function relation: N (K) = A / (1 + K) , 2, ..., K_ (max), where N (K) is the number of unit areas containing K earthquakes in the region taken. The C value in the equation characterizes the degree of concentration of the earthquake in the spatial distribution, which is called the concentration of seismic space. In this paper, nine cases of M_S≥5.8 earthquakes occurred in North China in 1970-1983 were studied. It is found that there is a clear anomaly rising process of C values within a large area around the epicenter before the earthquake, indicating that the magnitude before the large earthquake The concentrated process of the earthquake in space is obvious. The paper also discusses the relationship between the C value and the actual spatial distribution of the earthquake, the physical meaning of the C value, four estimation methods of the C value and its advantages and disadvantages, and the statistical distribution of the C value.