玉树7.1级地震前后电磁辐射小波变换分析
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摘要
基于电磁辐射数据的小波变换理论,对青海玉树7.1级地震前后四川都江堰、剑阁、江油及郑州二砂电磁波台站的观测数据进行了小波分析,研究发现玉树地震前有异常信息存在,表现为:地震前电磁辐射异常信号低频部分出现的时间较早;距震中较近的台站,异常信息出现的频率段较高;距震中稍远的台站,异常信息的频率段较低;震中距越大,异常出现的时间越晚。
By use of the wavelet analysis,the electromagnetic radiation data of the Yushu earthquake magnitude 7.1 in Qinghai province near Dujiangyan,Jiange,Jiangyou stations in Sichuan and Ersha station in Zhengzhou before and after the event,were studied in the different scales of wavelet detail decomposition and then it is found that there are anomalous information before the earthquake,and had interpretated preliminarily.The results show that,the first,the details of the wavelet decomposition show abnormal electromagnetic wave signal of low frequency before the earthquake portion of the earlier time;epicenter close to the station,the information that appears anomay in high frequency band;a little far from the epicenter of the station,the anomay in low frequency band information.The second,along with the epicentral distance increases,the smaller the radiation energy,the anomalies appear later.
By use of the wavelet analysis,the electromagnetic radiation data of the Yushu earthquake magnitude 7.1 in Qinghai province near Dujiangyan,Jiange,Jiangyou stations in Sichuan and Ersha station in Zhengzhou before and after the event,were studied in the different scales of wavelet detail decomposition and then it is found that there are anomalous information before the earthquake,and had interpretated preliminarily.The results show that,the first,the details of the wavelet decomposition show abnormal electromagnetic wave signal of low frequency before the earthquake portion of the earlier time;epicenter close to the station,the information that appears anomay in high frequency band;a little far from the epicenter of the station,the anomay in low frequency band information.The second,along with the epicentral distance increases,the smaller the radiation energy,the anomalies appear later.
引文
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2 Gotoh K,et al.Principal component analysis of ULF geomag-netic data for Izu islands earthquakes in July 2000[J].Geo-physical Research,2003,5:24-26.
3 Harada M,et al.Transfer function approach to signal discrim-ination of ULF geomagnetic data[J].Physics and Chemistryof the Earth,2004,29:409-417.
4陈化然,等.1980年以来我国电磁辐射地震前兆信息的观测与研究[J].中国地震,2008,(2):180-186.(ChenHuaran,et al.Observation and research on seismic precursorinformation of electromagnetic emissions[J].China Earth-quake,2008,(2):180-186)
5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,(增刊Ⅰ):29-32.(ZhangJianguo and Guan Huaping.Analysis of electromagnetic spec-trum before Zhangbei Ms6.2 earthquake[J].2010,(Supp.Ⅰ):29-32)
6王继军,等.中国地震电磁现象的观测与研究[J].大地测量与地球动力学,2005,(2):11-21.(Wang Jijun,et al.Observations and studies on emphenomena caused by earth-quake in China[J].Journal of Geodesy and Geodynamics,2005,(2):11-21)
7王继军,等.中国地震电磁现象的岩石实验研究[J].大地测量与地球动力学,2005,(2):22-28.(Wang Jijun,etal.Rock experiment for research on seismic electromagneticphenomena in China[J].Journal of Geodesy and Geodynam-ics,2005,(2):22-28)
8李美,卢军.地震电磁辐射前兆异常特征和异常指标关系研究[J].地震,2008,28(4):112-120.(Li Mei and LuJun.Study on characteristics and index relation of electro-magnetic precursory anomaly of earthquakes[J].Earth-quake,2008,28(4):112-120)
9刘序俨,等.定点形变数字观测中高频信号特征及提取方法[J].大地测量与地球动力学,2006,(增):5-10.(LiuXuyan,et al.Characteristics of high-frequncy singal in digi-talized observation of fixed point deformation and its extrac-tion method[J].Journal of Geodesy and Geodynamics,2006,(Supp.):5-10)
10丁跃军,陈化然,张建国.汶川8.0级地震前电磁辐射异常变化特征初步研究[J].地震地磁观测与研究,2009,30(3):11-15.(Ding Yuejun,Chen Huaran andZhang Jianguo.The preliminary research on anomalous vari-ation character of electromagnetic radiation before the Wen-chuan Ms 8.0 earthquake[J].Seismological and Geomag-netic Observation and Research,2009,30(3):11-15)
11 Morlet J,et al.Wave propagation and sampling theory[J].Geophysics,1982,47(1):203-211.
12 Mallat s.A theroy of multiresolution signal decomposition:The wavelet transform[J].IEEE Tram,1989,11(7):674-693.
13关华平,刘桂萍.震前电磁辐射异常与地震关系研究[J].地震学报,1995,17(2):237-246.(Guan Huapingand Liu Guiping.Electromagnetic radiation anomalies be-fore earthquakes and seismic relations[J].Acta Seismolog-ica Sinica,1995,17(2):237-246)
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