| 张北6.2级地震前电磁波频谱分析 |
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| 引用本文： | 张建国,关华平.张北6.2级地震前电磁波频谱分析[J].大地测量与地球动力学,2010,30(Z1). |
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| 作者姓名： | 张建国 关华平 |
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| 作者单位： | 1. 河北省地震局邯郸中心台,邯郸,056006
2. 中国地震局地震预测研究所,北京,100036 |
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| 基金项目： | 中央级公益性科研院所基本科研业务专项“华北地区电磁场动态演化特征研究”(059217); 中国地震局地震预测研究所基本科研业务(02092408); 河北省地震局重点项目“河北地区电磁场动态演化特征研究”(冀震发[2010]20号) |
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| 摘 要： | 基于波谱的FFT和小波变换理论,研究了张北地震前北京东三旗地磁台电磁波频谱变化特征。结果表明:1)张北地震前异常信息确实存在;2)电场较磁场异常显著,且NS分量强于EW分量;3)异常出现的时间主要集中在1997年12月31日、1998年1月1日,在时间进程上显示了明显的阶段性变化,这可能反映了地震不同孕育阶段的特征。
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| 关 键 词： | 张北地震 电磁波 频谱 FFT 小波变换 |
ANALYSIS OF ELECTROMAGNETIC SPECTRUM BEFORE ZHANGBEI Ms6.2 EARTHQUAKE |
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| Zhang Jianguo,Guan Huaping.ANALYSIS OF ELECTROMAGNETIC SPECTRUM BEFORE ZHANGBEI Ms6.2 EARTHQUAKE[J].Journal of Geodesy and Geodynamics,2010,30(Z1). |
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| Authors: | Zhang Jianguo Guan Huaping |
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| Institution: | Zhang Jianguo1) , Guan Huaping2)(1)H,an Central Seismostation,Earthquake Administration of Hebei Province,H,an 0560062)Institute of Earthquake Science,CEA,Beijing 100036) |
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| Abstract: | On the basis of the FFT spectrum and wavelet transform theory,the changing characteristics of electromagnetic wave frequence spectran of Dongsanqi station in Beijing before the Zhangbei earthquake are studied.The results are as follows.1) Anomalies did exist before the Zhangbei earthquake.2) Anomalous signals of the electric field are more significant than those of the magnetic field,and the NS component is stronger than the EW component.3) Anomalies appeared concentrately on Dec.31,1997 and Jan.1,1998 and ... |
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| Keywords: | Zhangbei earthquake electromagnetic wave spectrum fast fourier transform(FFT) wavelet transform |
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