The influence of anisotropic electrical resistivity on surface magnetotelluric responses and the design of two new anisotropic inversions

Abstract Using the 3-D axial anisotropy, dipping and azimuthal anisotropy as case studies, we investigated influence of each anisotropic resistivity element on magnetotelluric surface responses. To justify strong weak edge effect, have introduced indices for impedance components, effect tipper components. Interestingly, decoupled modes, found that $${\rho }_{xx}$$ ρ xx has a Z xy , yy T y while }_{yy}$$ yy strongly affects yx xx x . The three elements }_{zz}$$ zz }_{xz}$$ xz }_{yz}$$ yz only very all types For coupled mode, }_{xy}$$ xy display Based our studies elements, design propose two practical processes to replace conventional axial, dipping, azimuthal, general inversions. First, or inversion can be approximately into }_{x}$$ x -mode }_{y}$$ y mode inversions performed either independently in parallel, joint inversion. Second, since always show influence, simplified just reduced with outputs. Both proposed techniques save lot computational resources. Criteria choose modes depend greatly magnitudes distributions and/or Graphical