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地震

地震 ›› 2000, Vol. 20 ›› Issue (z1): 76-81.

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二进小波变换在地震前兆信号频率分解中的应用

严尊国1, 陈俊华1, 钱家栋2, 李胜乐1, 廖武林1   

  1. 1.中国地震局地震研究所 ,湖北 武汉 430071;
    2.中国地震局分析预报中心 ,北京 100036
  • 收稿日期:2000-05-08 修回日期:2000-06-12 出版日期:2000-09-30 发布日期:2022-09-23
  • 作者简介:严尊国 (1946-) ,男 ,江苏镇江人 ,研究员 ,主要从事地震学基础与地震预报研究。
  • 基金资助:
    地震联合基金“九五”重点课题资助 (95-07-431)

Application of method of binary wavelet transformation in resolution of earthquake precursor signal frequency

YAN Zun-guo1, CHEN Jun-hua1, QIAN Jia-dong2, LI Sheng-le1, LIAO Wu-lin1   

  1. 1. Institute of Seismology, CSB, Wuhan 430071, China;
    2. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:2000-05-08 Revised:2000-06-12 Online:2000-09-30 Published:2022-09-23

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摘要： 地震前兆的频率特征是认识前兆现象性质的一个重要内容 ,对其研究不仅有益于前兆识别、前兆机理的认识, 而且会促进其观测技术的改进与完善。以宝坻台 1970~ 1995年的地电阻率日均值资料为例, 提出利用二进小波变换方法将前兆数据序列分解成若干频段 ,进行异常识别与提取 ,这样能够大大地提高前兆识别可靠性 ,并推进前兆现象的研究。

关键词: 小波变换, 地震前兆, 频率

Abstract: To recognize the earthquake precursor phenomenon's characteristics, the frequency cha racteri zation of earthquake precursor is an important approach. The research on the f requency cha racteri zation of precursors can be helpful to recognize the precursor signals and to know precursor mechanism. This resea rchcan promote the improv ement and perfection of its observation system. By using the daily mean values of geoelectric resistivity of Baodi station from 1970 to 1995, according to the precursor pheno menabefo re Tang shanear thquakein 1976, we advanced a new method by using the binary wavelet transformation to so lv e the precursor da ta sequence into a series of successive frequency bands. Then to recognize and ex tract the anomaly signals, which can greatly improve reliability of precursor recognition and pro mote the study of precursor phenomena.

Key words: Wavelet transformation, Earthquake precursor, Frequency

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