全球、中国大陆和华北地区地震活动韵律性时变特征及趋势分析

The Rhythm of Earthquake Activity and Earthquake Tendency Analyses on Globality, Chinese Mainland and North China

基于Morlet小波变换 ,提出一种新的定量划分地震活跃期或平静期的分析方法 ,形成了根据复小波变换得到不同周期累加能谱极大值点变化、实小波变换振动周期谱时频分布以及指定周期的小波振动周期随时间变化的极值分布规律来研究地震活动韵律性及其时变特征的物理思路。通过对全球、中国大陆和华北地区浅源地震年释放能量的时间序列分析 ,对研究区强震活动的韵律性及其时变特征有了新的认识。根据目前强震活动具有的韵律性 ,结合历史地震活动情况 。

Based on the Morlet complex wavelet transformation,this paper puts forward a kind of new method that is used for distinguishing seismicity period and quietude period,and new physics thought by the change characteristics about wavelet accumulation energy spectrum with periods, time-frequency distribution of wavelet vibration period spectrum and wavelet vibration period spectrum of specified period with time. Applied above methods to time serial which is composed of earthquake accumulation energy per year on globality, Chinese Mainland and North China earthquakes, respectively. We got some new knowledge to the rhythm of shallow earthquake activity. Considered historical earthquake and the rhythm characteristics of seismicity, we discuss the earthquake tendency in the future.