The authors analyze, in this work, the polemic question of the signal, being measured by GPR, coming from depth greater than the plane wave skin depth. They conclude that signals are being measured, reflected from depths of the order of five times the skin depth for the 100 MHz frequency being used. They also estimate the dielectric constant for the mapped geologic formations using GPR.<br>More realistic values of K are obtained, for considering: a) the squared index of refraction, (c/v)2, as due to the electronic polarization, associated to the rock matrix, KM; b) the orientational polarization for the saline water, equal to 78, being considered for the water saturated pore spaces of the rocks, Kf. The mixed relation for a two components material was then used for the finalestimation.


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