Abstract

The standard expression for the anomaly of a magnetized dyke consists of two elementary functions which in practice are easily separable. Under certain conditions, these functions have a simple symmetry which makes them plottable as families of logarithmic master-curves; and in each family there is a systematic change of shape corresponding to a depth/breadth parameter of the dyke. On this basis the problem of analysis can be made as simple and direct as the method commonly used for depth determinations by electrical resistivity. In addition to the dyke model, two other closely related classes are developed which thus provide master curves that can be used for a large variety of two-dimensional anomalies.

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