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We describe a multiscale method to estimate the excess mass of gravity anomaly sources,\udbased on the theory of source moments. Using a multipole expansion of the potential field and\udconsidering only the data along the vertical direction, a system of linear equations is obtained.\udThe choice of inverting data along a vertical profile can help us to reduce the interference effects\uddue to nearby anomalies and will allow a local estimate of the source parameters. A criterion\udis established allowing the selection of the optimal highest altitude of the vertical profile data\udand truncation order of the series expansion. The inversion provides an estimate of the total\udanomalous mass and of the depth to the centre of mass. The method has several advantages\udwith respect to classical methods, such as the Gauss’ method: (i) we need just a 1-D inversion\udto obtain our estimates, being the inverted data sampled along a single vertical profile; (ii) the\udresolution may be straightforward enhanced by using vertical derivatives; (iii) the centre of\udmass is also estimated, besides the excess mass; (iv) the method is very robust versus noise;\ud(v) the profile may be chosen in such a way to minimize the effects from interfering anomalies\udor from side effects due to the a limited area extension. The multiscale estimation of excess\udmass method can be successfully used in various fields of application. Here, we analyse the\udgravity anomaly generated by a sulphide body in the Skelleftea ore district, North Sweden,\udobtaining source mass and volume estimates in agreement with the known information. We\udshow also that these estimates are substantially improved with respect to those obtained with\udthe classical approach

Multiscale estimation of excess mass from gravity data