| 基于HHT变换的汾渭地震带中强地震活动特征分析 |
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| 引用本文： | 邢西淳,毛娟,王平,邵辉成.基于HHT变换的汾渭地震带中强地震活动特征分析[J].地震地磁观测与研究,2013(5):80-86. |
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| 作者姓名： | 邢西淳 毛娟 王平 邵辉成 |
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| 作者单位： | [1]泾阳地震台,中国陕西713704 [2]陕西省地震局,中国西安710068 |
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| 基金项目： | 中国地震局“三结合”课题、“十二五”科技支撑项目“南北地震带强震综合预测与跟踪方法研究”（2012bak19b01-07）资助 |
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| 摘 要： | 利用HHT方法,对汾渭地震带1965-2011年度最大地震时间序列进行逐级分解,得到4个本征模态函数（IMF）项和一个趋势项.分析各IMF分量不同周期成分,结果显示,汾渭地震带地震活动存在比较稳定的周期,具有一定的时变性.1965年以来,在IMF1-IMF4的时间尺度上汾渭地震带Ms≥4.0地震有5个活跃期,M≥4.0地震存在3年和7年左右的活动周期,还存在16年、23年、44年左右的弱活动期.
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| 关 键 词： | Hilbert-Huang变换 经验模态分解 地震活动性 周期分析 |
The strong earthquakea ctivity analysis of Fenwei seismic zone based on HHT transformation |
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| Xing Xichun,Mao Juan,Wang Ping,Shao Huicheng.The strong earthquakea ctivity analysis of Fenwei seismic zone based on HHT transformation[J].Seismological and Geomagnetic Observation and Research,2013(5):80-86. |
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| Authors: | Xing Xichun Mao Juan Wang Ping Shao Huicheng |
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| Institution: | 1.Jingyang Seismic Station, Shaanxi Province 713704, China; 2.Earthquake Administration of Shaanxi Province, Xi＇an 710068, China;) |
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| Abstract: | With the HHT method,the annual maximum seismic time series in Fenwei seismic zone from 1965 to 2011 are gradully decomposited,and four intrinsic mode functions （IMF） items and a trend item are obtained.The different cycles ingredients of each IMF component are analyzed.The results show that the seismic activity of Fenwei zone has stable cycle,but also has a certain time-varying.Since 1965,there are five active cycles with Ms≥4.0 earthquakes in Fenwei seismic zone in the time scale IMF1-IMF4.There are also exist activity cyclye of about three years and seven years with M≥4.0 earthquakes.There exist also 16 years,23years,44 years or so weak activity period. |
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| Keywords: | Hilbert-Huang transform empirical mode decomposition （EMD） seismic activity cycle analysis |
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