• 责任者：Zhang Xiaotao (Central Seismic Station of Handan ; Earthquake Administration of Hebei Province ; Handan 056001 ; China) ; Feng Xiangdong
• 刊名：Journal of Seismological Research
• 出版年：2011
• 卷期：34(1)
• 关键词：小波变换 ; wavelet transform ; 地震活动性 ; seismicity ; 华北地区 ; North China
• 页码：p.24-29
• 图表：3 illus., 23 refs.
• 分类号：0500
• 出版序号：20120103
• issnNo：ISSN1000-0666
• isbnNo：CN53-1062/P

Referring to the M≥5.0 earthquakes from 1500 to 2000 and the M≥4.0 earthquakes from 1970 to 2009 in North China, the authors 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.oft-com:office:office" />