HR: 16:15h
AN: GP24A-03    [Abstracts]
TI: An alternative 3D source inversion method for magnetic anomalies with depth resolution
AU: * Pignatelli, A
EM: pignatelli@ingv.it
AU: Nicolosi, I
EM: nicolosi@ingv.it
AU: Chiappini, M
EM: chiappini@ingv.it
AB: In this paper we present a new method to invert magnetic anomaly data aimed at characterizing magnetic sources in a variety of geological contexts. Our algorithm makes use of a dipolar approximation to compute the magnetic field of discrete blocks. We show how this approximation does not affect significantly the success of the inversion method. Furthermore, it presents numerous advantages in terms of computing speed and portability, so that magnetic sources can be resolved directly in the field using a laptop computer. In addition, the introduction of analytic, rather than objective or empirical, weighting functions aimed at contrasting the natural decay of the signal amplitude with depth, makes the method robust and general enough to allow depth resolution in a large variety of case studies. Geophysical exploration and crustal modelling would be benefited by the use of such a method. The algorithm is tested on synthetic as well as on real field data sets.
DE: 1517 Magnetic anomaly modeling
DE: 3005 Geomagnetism (1550)
DE: 3260 Inverse theory
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2005 Joint Assembly