Abstract

The horizontal, conducting thin-sheet model represents a special interest in interpretation of electromagnetic field data since it is a suitable interpretation model for the surficial conductive layer, a common occurrence in many terrains. For small thicknesses of overburden layers (≤.05 Tx − Rx separation) the resolution of layer thickness and conductivity is not possible and interpretation needs to be carried out in terms of the layer conductance. An attractive feature of the thin-sheet model is the simplicity with which the time-domain response  
Hzs=m4π[2zz01(xx0)2+(yy0)2+(z+z0+2t/σdμ0)2]z=z0=0;y=y0=0=m4π[(r22t2/σ2d2μ02)/(r2+t2/σ2d2μ02)5/2],
(1)
can be calculated. The step response of an infinitely thin layer was derived by Maxwell (1891). In this paper I derive the Crone pulse electromagnetic (PEM) response of a conducting infinitely thin horizontal layer. Applicability of the study is demonstrated by means of a field example.
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