Determination of sheet-like geological structures parameters using Marquardt inversion of the magnetic data

Abstract

A stable inversion method to estimate the depth to top, width and dip of a sheet-like geological structure from pole-reduced magnetic field is introduced. The inverse modelling is based on Marquardt optimization algorithm. The performance of the proposed method is considered by the theoretical magnetic data due to some dyke–shape models, with and without random noise. The inverted parameters convergence demonstrates the ability of the inversion approach as a powerful and useful tool, especially where the data are corrupted with noise. We employ this method for interpreting a real magnetic data set produced by a tabular structure from Iran. The inferred structure has approximately a depth to top of 17.12 m, a width of 12.74 m and a dip of 100.8 degree anticlockwise from horizontal, i.e. 10.8 degree from vertical towards east.