基于小波分析的地震能量释放研究

Study on Seismic Energy Release Based on Wavelet Analysis

基于地震能量与贝尼奥夫应变的关系,采用1990~2016年云南省地震局发布的所有震级地震目录和1969~2016年中国地震台网中心发布的M≥5.0地震目录,计算得到云南和中国及邻区的地震应变释放时间序列,然后采用连续小波变换方法分析出地震周期并讨论其特征和成因。结果表明,云南地区地震活动大致具有4000 d(约11 a)的地震活动长周期,其中2008年大致具有12 d和32 d的短周期;中国及邻区地震活动大致具有400 d(约1 a)、1400 d(约4 a)的短周期和6 a、16 a、27 a的长周期。

Based on the relationship between seismic energy and Benioff strain,the catalog of all seismicity from Yunnan seismic network between 1990 and 2016 as well as the catalog of M≥5.0 seismicity from China seismological network between 1969 and 2016 are used in this paper.The time series of seismic strain release in the Yunnan and its neighboring area,and then the continuous wavelet transform method,are used to analyze the earthquake period and discuss its characteristics and causes.The results show that the seismic activity in Yunnan contains long periods of about 1,400 d(11 a)from 1990 to 2016.It also contains short periods of 12 d and 32 d in 2008.Furthermore,it contains short periods of about 400 d(1 a),1400 d(4 a)and 6 a as well as long periods of about 16 a and 27 a from 1969 to 2016.