Response Characteristics of Central Frequency Sounding over a Multi-layer Earth

Abstract

Summary.

Digital filter method is applied to computation of multi-layer central frequency sounding (CFS) response. Two-, three-, four- and five-layer earth models are considered and the corresponding responses computed. Resolution of layer parameters and applicability of CFS systems over a multi-layer model are discussed. Studies indicate that the performance of CFS system up to three to four-layer cases is satisfactory while for more than four layers resolution is poor even for significant conductivity contrasts. Although this limits the applicability, CFS is expected to be quite useful for shallow investigations in hard rock areas, normally not involving more than three layers.