地震时间序列的周期图分析方法和极大熵谱分析方法

利用华北地震区的地震资料（1000～1977）,对地震时间序列进行了周期图分析和极大熵谱分析,提取了隐含在随机噪声中的隐含周期。结果表明,这两种方法所得结果很接近,地震应变能√Ei;释放的隐含周期利用周期图分析提取的主要周期是30年、245年和305年,极大熵谱分析方法提取的主要周期是30年、240年和300年。这三个主要周期存在“倍30”的关系,240年和300年周期是30年周期的整数倍。30年周期反映了各活跃幕中的幕式活动规律,300年周期同各活跃期高潮时段之间的时间差的平均值相符,华北自1000年以来的四个活跃期高潮时段之间的时间差平均值是300年。

ANALYSIS METHDDS OF PERIODGRAM AND MAXIMUM ENTROPY SPECTRUM FOR SEISMIC TIME SEQUENCE

The authors have analysed the seismic time sequence by using periodgram and maximum entropy spectram methods according to the data (1000-1997) of North China,and obtained the implicit period from the random noise. The results show that the conclusions from the two methods are very closely,the main period obtained by p.eriodgram method through seismic strain energy Eireleasing is 30,245 and 305 years,the main period obtained by maximum entropy spectrum method is 30,240 and 300 years. The three main periods exist" 30 multiple" relationship. The period of 30 years reflects the episode active regularity, the period of 300 years consists with the mean value of the moveout of each active climax time, and the mean value is 300 years since 1000 in North China.