. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 16.—Curves of apparent resistivity over surface layer of thickness h for differ- ent ratios of resistivities of surface layer and infinite lower layer (after Hummel). methods in civil engineering work and related geological problems where the thickness of the overburden above bedrock is to be de- termined. In such cases the resistivity of the bedrock is ordinarily so much greater than the resistivity of the overburden that the curves approach the theoretical case where the lower resistivity may be considered as infin
. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 16.—Curves of apparent resistivity over surface layer of thickness h for differ- ent ratios of resistivities of surface layer and infinite lower layer (after Hummel). methods in civil engineering work and related geological problems where the thickness of the overburden above bedrock is to be de- termined. In such cases the resistivity of the bedrock is ordinarily so much greater than the resistivity of the overburden that the curves approach the theoretical case where the lower resistivity may be considered as infinite. For a comparison with the results obtained in practice, see the curves shown in Figure 27. The diagrams shown in Figure 17 a and b represent the results of the theoretical analysis for the 3-layer case. In Figure 17 a, the second medium has the lowest resistivity; in Figure 17 b, the second medium has the highest resistivity. It is seen that in this case (3-layer prob- lem) the peaks in the curves represent approximately the depth to 453
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