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《Chinese Journal of Geophysics》 2014-02
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Characteristics of multiple sources and tensor measurement in CSAMT

WANG Xian-Xiang;DI Qing-Yun;XU Cheng;Key Lab of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
The traditional current electrodes arrangement in Controlled-Source Audiomagnetotellurics method(CSAMT)is"一"type,this arrangement has some significant disadvantages—there are weak areas for all components,Ey and Hx are weak in the area where Ex and Hy are strong.Moreover,it is hard to take the normal measurements in the field angle of 360degree and tensor measurement.In order to eliminate these defects,an"L"type source was designed and the expression formula of each component in the source,which was verified through an experiment in a simple homogeneous semi-space,was presented in this paper.A newly designed signal emission model which avoids the weak area for each component in the field angle of 360degree was developed subsequently.Tensor measurement with this new"L"type source and the calculation of tipper,complex skew as well as coordinate system rotation indicate that one can obtain better results by tensor measurement than by scalar measurement.The latter is supposed tobe applicable in 1-D structure while might bring some bias in 2-D or 3-D geological structure.
【Fund】: 中国科学院工程地质力学重点实验室开放基金项目(KLEG201103);; 国家公益性专项(201011079);; 国家自然科学基金(4117411)联合资助
【CateGory Index】: P631.325
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