Abstract
The variations in the apparent resistivity due to a four-layer Earth model under stress have been studied with the aid of a numerical model. The effect of the stress produced by vertical uplifts of the bottom layer by as much as 1.5–20 m, for layer thickness h = 1.8–24 km, source period T = 1–60 min and varying conductivity composition of the layers, has been examined. The results reveal a gradual decrease in the apparent resistivity with increase in stress. This decrease in the apparent resistivity is particularly pronounced at shorter periods and for thicker layers. The change in apparent resistivity was also found to be enhanced when the first and third layers have conductivities much higher than that of the second layer.
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