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Title:: Research on the Characteristics of Seismic Activity in North China Using Wavelet Transform

作者:: 张小涛¹; 2; 冯向东³; 张跃刚³; 张双凤¹; 杨雅琼³; 韩丽萍¹; (1.河北省地震局邯郸中心台,河北邯郸 056001; 2.吉林大学地球探测科技与技术学院,长春 130026; 3.河北省地震局,石家庄 050021)

Author(s):: ZHANG Xiao-tao¹; 2; FENG Xiang-dong³; ZHANG Yue-gang³; (1.Central Seismic station of Handan,Earthquake Administration of Hebei Province,Handan 056001,Hebei,China)(2.Jilin University,Changchun 130026,Jilin,China)(3.Earthquake Administration of Hebei Province,Shijiazhuang 050021,Hebei,China)

Keywords:: Benioff strain; wavelet transform; seismic active period; seismic quiet period; North China

摘要:: 运用小波变换方法,以不同的小波时间尺度分析了华北地区1480～2009年M≥5.0和1970～2009年M≥4.0地震的贝尼奥夫应变数据,得到了不同时间尺度的地震活跃期和平静期。分析表明:目前华北地区从1480年以来的M≥5.0地震活动刚过活跃期,处于应力积累阶段,而1970年以来M≥4.0地震存在7年左右的活动周期,目前正在进入4级以上地震的活跃期。

Abstract:: Referring to the M≥5.0 earthquakes from 1500 to 2000 and the M≥4.0 earthquakes from 1970 to 2009 in North China,we analyze the Benioff strain using wavelet transform in various scales.Analysis shows that on a century-scale the M≥5.0 earthquake-activity period has just finished and now the stress is accumulating.And since 1970 there has existed activity cycle of about 7 years for the M≥4.0 earthquakes; now the M≥4.0 significant earthquake-activity period is beginning in North China.