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THE STUDY OF ATTENUATING STATIC EFFECTS WITH ELECTROMAGNETIC ARRAY PROFILING

Luo Zhiqong (China University of Geosciences, Wuhan 430074)  
In magnetotelluric sounding, the MT responses would be seriously distorted and the information of deep geological targets would be obscured by the near-surface conductivity inhomogeneities. The characteristics of the transfer function of electric field E indicats that the near-surface response could substantially super-pose the ones of the deep structures. In 2-D case, the transfer function for E component being perpendicular to the strike plays a role as a high-pass filter with respect to the wave number η as ω approaches to zero . Electromagnetic array profiling (EMAP) is a new approach which can expand the information acquisi-tion and effectively attenuate the static effects by imposing a low pass filter to contract the high-pass characteristics of transfer function E in wavenumber domain. The examples have shown the effectiveness of EMAP method in attenuating the static shifts in MT data.
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