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《Chinese Journal of Geophysics》 2012-12
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Effect rules of strong noise on magnetotelluric(MT) sounding in the Luzong ore cluster area

TANG Jing-Tian1,XU Zhi-Min2,XIAO Xiao1,LI Jin1 1 Institute of Geosciences and Info-Physics,Central South University,Changsha 410083,China 2 Northwest Research Institute of Engineering Investigations and Design,Xi′an 710003,China  
Natural earth electromagnetic field signal is weak,with random polarization directions,highly susceptible to electromagnetic noise.Tensor impedance analysis,the remote reference technology,and Robust estimation can suppress the effect of random noise and uncorrelated noise,but currently no effective methods can suppress strong noise.The Luzong ore concentration area is densely populated,with highly developed industry,also one of China′s famous bases of iron,copper,sulfur and other minerals.In this region,strong noise for industry,communication,mining,civil and other electromagnetic interference is a serious pollution to magnetotelluric sounding data.Firstly,according to the measured electromagnetic field time domain waveform and Cagniard resistivity sounding curve shape,we pick out the basic non-noise pollution measurement points(Y1650).Then we use mathematical morphology to extract the class of square wave,triangle wave,step,impulse,and charging and discharging of five kinds of typical noise waveforms.And we stack these noise waveforms in a different way and Y1650 of the electromagnetic field waveform from the electromagnetic field time series of highly contaminated,and make contrast analysis added noise Y1650 point resistivity and phase sounding curve changes.Finally we summarize the effect rules of the typical strong noises on magnetotelluric sounding data in Luzong,and provide the basis for the further suppression of strong noise and data processing.
【Fund】: 国家科技专项(SinoProbe-03);; 国家自然科学基金重点基金项目(40930418);; 地质大调查项目(1212010813052);; 湖南省教育厅资助科研项目(11B074)联合资助
【CateGory Index】: P631.325
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