A new semiautomatic interpretation technique for aeromagnetic data

The analytic signal amplitude of the Tilt angle of the magnetic anomaly from a dyke and from a contact is shown to give the distance r to the dyke. Local minima of r give the depth to the source, and the position of these minima gives its location. Because of the use of the analytic signal amplitude, the depth to the top of the dyke is almost unaffected by the magnetisation vector of the dykes.