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地震 ›› 2014, Vol. 34 ›› Issue (4): 88-99.

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基于Wigner-Ville分布的地磁前兆异常提取方法及其在川滇地区的应用

何康1, 晏锐2, 王春3, 郑海刚1, 李军辉1, 方震1   

  1. 1.安徽省地震预报研究中心,安徽合肥230031;
    2.中国地震台网中心,北京100045;
    3.黑龙江省地震局,黑龙江哈尔滨150090
  • 收稿日期:2014-03-11 修回日期:2014-07-23 发布日期:2020-09-11
  • 作者简介:何康(1982 ),男,湖北大悟人,硕士研究生毕业,主要从事地震电磁学和地震预报等研究。
  • 基金资助:
    “十二五”国家科技支撑项目( 2012BAK19B02- 03)和中国地震局2013年度震情跟踪青年课题(20 13020403)资助

Extracting Geomagnetic Precursory Anomaly based on Wigner-Ville Distribution and Application in the Sichuan- Yunnan Region

HE Kang1, YAN Rui2, WANG Chun3, ZHENG Hai-gang1, LI Jun-hui1, FANG Zhen1   

  1. 1. Earthquake Administration of Anhui province,Hefei 230031,China;
    2. China Earthquake Networks Center, Bejjing 100045,China;
    3. Earthquake Administration of Heilongjiang province, Harbin 150090,China
  • Received:2014-03-11 Revised:2014-07-23 Published:2020-09-11

摘要: 为了能够从强背景场中提取较弱的震磁信息,采用平滑伪Wigner-Ville 分布方法对川滇地区的地磁场Z分量数据开展时频分析。通过研究Z分量滤波后主要周期为2~6 h部分中的不同周期分量变化,发现其中2.4h的周期分量受到外源场影响较大,而4.4h的周期分量在多次显著地震前均出现明显的高值异常。

关键词: 地磁Z分量, Wigner-Ville分布, 前兆异常, 川滇地区, 芦山地震

Abstract: To extract weak seismo-magnetic information from strong background field, we carry out time- frequency analysis of geomagnetic Z-component in Sichuan—Yunnan region using Smoothed and Pseudo Wigner- Ville Distribution( SPWVD). By studying different periodic components of the filtered Z-component , which main periods are 2~6 h,we find that the 2.4 h periodic component is easy to be affected by external field, and the 4.4 h periodic component shows obvious high value of anomalies before many significant earth- quakes in the region.

Key words: Geomagnetic Z-component, Wigner-Ville distribution, Precursory anomaly, Sichuan-Yunnan region, Lushan earthquake

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