Abstract:

The authors introduce a new method for computing the wholetime apparent resisitivity from the transient response generated by a large rectangular loop over the ground. In this method, bisection strategy is used to get the whole-time apparent resisitivity from the induced voltage of a uniform half space model. We start our computation in an early time window, and use the corresponding result in the second time window. This process is repeated until all the time intervals have been processed. The test on the theoretical model and real data show that the presented method is correct and effective.

Key words: large loop source, TEM sounding, whole-time apparent resistivity, bisection method