Inversion of magnetic anomaly affected by strong remanent magnetization over rugged terrain: A case study from Daye, China

Abstract

We present a case study on inverting magnetic data acquired over rugged terrain and influenced by strong remanent magnetization. These factors pose significant challenges for processing and inversion of such data. To tackle these challenges, we propose a strategy through the joint use of the equivalent source technique and 3D amplitude inversion to perform 3D magnetization inversions. Equivalent source processing is used to calculate the amplitude data in the space domain since use of the wavenumber-domain is difficult due to large elevation relief. We then carry out the amplitude inversion to generate a 3D subsurface distribution of effective susceptibility when strong remanent magnetization is present and the general magnetization direction cannot be estimated. The inversion results of aeromagnetic data in Daye Mine in China show that this approach is feasible and effective.