摘要
采用首都圈地区的跨断层观测资料,利用小波分析获取其长趋势信息和细节信息,并对细节信息进行时频分析,获取其中周期信号的频率,去除原始数据中的周期性影响因素。通过计算断层三维活动量、垂直活动量综合指标,获取其反映的断层形变时空变化及断层活动特征。根据断层活动协调比指标,获取断层“异常”活动特征,并结合震例分析其前兆意义,可作为今后首都圈及邻近地区中强地震危险性分析的一种依据。
On basis of fault crossing deformation data of Capital Circle Region,we obtain long trend information and detailed information using wavelet decomposition and reconstruction,and get the frequency of the periodic signal using time-trequency analysis of wavelet detail signals and remove the cyclical factors in the original data.In order to analyze the present-day activity characteristics of the fault in Capital Circle Region,the three-dimensional activity of the fault and comprehensive index of vertical activity are calculated.According to the coordinative ratio index of fault activity,the"abnormal"activity characteristics of the fault are obtained,and the precursory significance is analyzed in combination with earthquake cases,which can be used as a basis for the risk analysis of medium-strong earthquakes in the capital area and its adjacent areas in the future.
作者
王世进
张超
尹海权
刘文龙
WANG Shijin;ZHANG Chao;YIN Haiquan;LIU Wenlong(First Crust Deformation Monitoring and Application Center,CEA,Tianjin 300180,China)
出处
《华北地震科学》
2022年第1期92-98,共7页
North China Earthquake Sciences
基金
中国地震局监测、预测、科研三结合课题(CEA-JC/3JH-163712)
第一监测中心基金项目(FMC2022017)。
关键词
首都圈地区
跨断层形变资料
小波分析
地震危险性
Capital Circle Region
fault crossing deformation data
wavelet analysis
earthquake risk
