Fig. 4

(top) Logarithmic plots of the overall impedance tensor influence index \({Z}_{xx}^{\mathrm{inf}}\),\({Z}_{yy}^{\mathrm{inf}}\), \({Z}_{xy}^{\mathrm{inf}}\), and \({Z}_{yx}^{\mathrm{inf}}\) when varying a \({\rho }_{x}\), b \({\rho }_{y}\), and c \({\rho }_{z}\), respectively. (bottom) Logarithmic plots of the overall tipper edge effect indices \({T}_{x}^{\mathrm{edge}}\), and \({T}_{y}^{\mathrm{edge}}\) when varying d \({\rho }_{x}\), e \({\rho }_{y}\), and f \({\rho }_{z}\), respectively. The varying resistivity values are shown on the x-axis. The dashed lines mark 10% for \({Z}_{ij}^{\mathrm{inf}}\) and 50% for \({T}_{i}^{\mathrm{edge}}\) for reference. The asterisk and square are for the cases where the buried depth of the 3-D body is 0 km and 5 km, respectively