Horizontal electric dipole over inhomogeneous earth model having linear variation of conductivity with depth

The behaviour of the electromagnetic (em) field response of a horizontal electric dipole placed over the surface of a vertically inhomogeneous earth model having linear variation of conductivity with depth is studied. The problem is solved for a multi-layer earth model with an intermediate inhomogeneous layer, and numerical results are obtained for these three-layer earth models with the intermediate transitional layer possessing the linear variation of conductivity with depth. The effect of variation of transition layer thickness and conductivity contrast between the top and the bottom layers are presented in the form of the absolute-amplitude ratio of the em field components expressed as a function of numerical distance. Analysis shows the characteristic dependence of the em field response on conductivity inhomogeneity.