中国华北和南北地震带北段8级大震发生的时间规律

Temporal Regularity of over 8 strong earthquakes in North China and the northernpart of North-South Seismic Belt

用以25年为周期的三性分布拟合华北和南北地震带北段8级大震发生的时间分布,发现拟合较好,因之在今后预测8级大震时可作为参考。三性分布是指周期性、倍周期性和每个周期的黄金分割性组成的时间分布。

Good results have been got from fitting temporal distribution of over 8 earthquakes in North China and the northern segment of North-South Seismic Belt with three kind distributions that have 25 years＇ cycle. The three kind distributions are periodicity distribution, multiplier periodicity distribution and the golden section distribution.