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Authors: Pignatelli, A.* 
Nicolosi, I.* 
Chiappini, M.* 
Title: An alternative 3D inversion method for magnetic anomalies with depth resolution
Issue Date: Aug-2006
Series/Report no.: 4-5/49 (2006)
Keywords: inversion
magnetic field
weighting function
dipolar approximation
depth resolution
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
Abstract: This paper presents a new method to invert magnetic anomaly data in a variety of non-complex contexts when a priori information about the sources is not available. The region containing magnetic sources is discretized into a set of homogeneously magnetized rectangular prisms, polarized along a common direction. The magnetization distribution is calculated by solving an underdetermined linear system, and is accomplished through the simultaneous minimization of the norm of the solution and the misfit between the observed and the calculated field. Our algorithm makes use of a dipolar approximation to compute the magnetic field of the rectangular blocks. We show how this approximation, in conjunction with other correction factors, presents numerous advantages in terms of computing speed and depth resolution, and does not affect significantly the success of the inversion. The algorithm is tested on both synthetic and real magnetic datasets.
Appears in Collections:Annals of Geophysics

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