An Easy Procedure to Estimate the Preliminary Shape of a Complex Magnetic Anomaly Through Inversion Software

The inversion of magnetic data is a difficult task when remanent magnetization is present. The available softwares do not take into account the remanence component in order to simplify the involved mathematics and reduce the time consuming processing.<br>Here, we examine and compare two different approaches to invert a magnetic complex anomaly set with induced and remanent magnetization, using transformations of the total magnetic field. The first method uses the analytic signal of the vertical integral of the TMI data. The second method uses the amplitude of the magnetic anomaly field. Both methods simulates the anomaly responses as they were just induced under a vertical magnetic field. The University of British Columbia’s Geophysical Inversion Facility (UBC-GIF, mag3d and grav3d programs) were used to invert the data. The susceptibility models resultant from both methods were compared with gravity inversion over the same anomaly. The outcome models show a certain difference in the result parameters, however, the overall result can be used for a preliminary estimation of the anomaly and instigate the further pass of research.