Fig. 10

a The surface logarithmic plot of \({Z}_{xy}^{\mathrm{inf}}(s)\), \({Z}_{yx}^{\mathrm{inf}}(s)\), \({Z}_{xx}^{\mathrm{inf}}(s)\), and \({Z}_{yy}^{\mathrm{inf}}(s)\), and \({T}_{x}^{\mathrm{edge}}(s)\), and \({T}_{y}^{\mathrm{edge}}(s)\) at all 484 stations from top to bottom rows, respectively, obtained when the 3-D anisotropic body in Fig. 1 (shown as a dashed line) is assigned with \({\mathbf{R}}_{z}^{T}(45^\circ ){\widehat{{\varvec{\rho}}}}_{{\varvec{x}}}{\mathbf{R}}_{z}(45^\circ )\) and buried at the surface (0 km), and at a depth of 5 km, given \({\widehat{{\varvec{\rho}}}}_{{\varvec{x}}}=\left[\begin{array}{ccc}500 & 0& 0\\ 0& 50 & 0\\ 0& 0& 50\end{array}\right]\). b Logarithmic plots of \({Z}_{xx}^{\mathrm{inf}}\), \({Z}_{yy}^{\mathrm{inf}}\), \({Z}_{xy}^{\mathrm{inf}}\), \({Z}_{yx}^{\mathrm{inf}}\), \({T}_{x}^{\mathrm{edge}}\), and \({T}_{y}^{\mathrm{edge}}\) with \({\mathbf{R}}_{z}^{T}(45^\circ ){\widehat{{\varvec{\rho}}}}_{{\varvec{x}}}{\mathbf{R}}_{z}(45^\circ )\), when \({\widehat{{\varvec{\rho}}}}_{{\varvec{x}}}=\left[\begin{array}{ccc}{\rho }_{x}& 0& 0\\ 0& 50 & 0\\ 0& 0& 50\end{array}\right]\) with \({\rho }_{x}\) equaling 0.5, 5, 500, and 5000 Ω-m shown on the x-axis