Fig. 3

The surface logarithmic plot of the impedance tensor influence indices \({Z}_{xy}^{\mathrm{inf}}(s)\), \({Z}_{yx}^{\mathrm{inf}}(s)\), \({Z}_{xx}^{\mathrm{inf}}(s)\), and \({Z}_{yy}^{\mathrm{inf}}(s)\) and the tipper edge effect indices \({T}_{x}^{\mathrm{edge}}(s)\), and \({T}_{y}^{\mathrm{edge}}(s)\) at all 484 stations from top to bottom rows, respectively, obtained from (a) the iso5 model, (b) the iso500 model (c) \({\rho }_{x}\) = 5 Ω-m, (d) \({\rho }_{x}\) = 500 Ω-m, (e) \({\rho }_{y}\) = 5 Ω-m, (f) \({\rho }_{y}\) = 500 Ω-m, (g) \({\rho }_{z}\) = 5 Ω-m, and (h) \({\rho }_{z}\) = 500 Ω-m, respectively, where the buried depth of the 3-D body in Fig. 1 (shown as dashed square) is 5 km