Normalized source strength and it application to estimate magnetic source location in the presence of remanent magnetization

Abstract

Summary For a number of widely used models (e.g., dipole, line of dipoles, dike and contact models), normalized source strength (NSS) can be derived from eigenvalues of the magnetic gradient tensor. The NSS is independent of magnetization direction and its amplitude is only affected by magnitude of magnetization. The NSS is a homogenous function and satisfies Euler’s homogeneity equation. Therefore, Euler deconvolution of the NSS can be used to estimate source location. In our algorithm, we use data points enclosed by a square window centered at maxima of the normalized source strength for estimating the source location and structural index, simultaneously. The window size is increased until it exceeds a predefined limit. Then the solution corresponding to the minimum uncertainty is chosen as the most reliable solution.