天体测量技术及应用研究组知识库

采用1850—2012年期间USGS全球M≥5.0地震目录资料,构成全球地震能量-时间序列,进行小波变换和准周期分析.结果表明,全球地震能量释放的时间序列存在9年、19年和45年的3个准周期,其中,45年准周期最为突出.结合起潮力周期的物理背景,对长周期潮汐起潮力与地震能量释放准周期的关系进行了探讨,没有发现全球地震活动的能量释放与潮汐短周期相关的准周期.

Using USGS global catalog of M >= 5. 0 seismicity between 1850 and 2012, a group of time series of global seismic energy release are obtained. The wavelet transform is applied to these time series in order to analyze the quasi-periodic characteristics. The results show that the time series of global seismic energy release contain three quasi-periodic components of 9-year, 19-year and 45-year. It is worth noting that the 45-year quasi-periodic component is most obvious. Combined with the physical background of the tidal force period, the correlations between long-periodic astronomical tidal forces and quasi cycles of seismic energy release are discussed. Quasi-periodic component related to the short-periodic astronomical tide is not found in the global seismic energy release.