The use of B-field measurements in an airborne time-domain system ? Part II: examples in conductive regimes

Abstract

Explorationists are increasingly concerned with finding more difficult targets such as those under cover. Significant developments in Airborne Electromagnetic (AEM) technology are now providing advanced tools for exploration in these scenarios. Recovering the magnetic field B rather than dB/dt from a towed sensor boosts the response from a high-conductance target, as is readily shown with model calculations. The advantage of B-field data in the presence of noise is illustrated with a GEOTEMDEEPÔ field example over a known conductive body that is covered by a thick conductive sequence and is difficult to detect from dB/dt data alone.