首都圈地区小震活动月频次分布特征

利用Kolmogorov-Smirnov分布检验法,对2000-2006年首都圈地区小震月频次分布进行了检验。 结果表明, 首都圈地区小震活动月频次符合正态分布, 而不符合泊松分布。 月频次累计次数与月频次之间的关系与G-R关系类似。 对月频次分布随时间的变化做了进一步分析, 发现在首都圈及其邻近地区发生的4次M_L≥5.0以上地震前, 月频次分布均表现出明显的变化。 这可能为利用地震活动性开展地震预测提供一个新的方法。

The distribution characteristics of monthly number for small earthquakes in the capital area of China

The Kolmogorov-Smirnov test is used in this paper to test the distribution of monthly number for small earthquakes occurred in the period from 2000 to 2006 in the capital area of China. The results show that the distribution of the monthly number agrees with normal distribution, rather than possion distribution. The relationship between the accumulative frequency of the monthly number and the monthly number resembles the Gutenberg-Richter law. Further analyzing the changes of the monthly number with time, it is found that before the four earthquakes with M_L≥5.0 occurred around the capital area, the distribution of the monthly number changes obviously. It may provide a new method of earthquake prediction by using earthquake activity.