Magnetic-survey data in grid form may be interpreted rapidly for source positions and depths by deconvolution using Euler' s homogeneity relation. The method employs gradients, either measured or calculated. Data need not be pole-reduced, so that remanence is not an interfering factor. Geologic constraints are imposed by use of a structural index. Model studies show that the method can locate or outline confined sources, vertical pipes, dikes, and contacts with remarkable accuracy. A field example using data from an intensively studied area of onshore Britain shows that the method works well on real data from structurally complex areas and provides a series of depth-labeled Euler trends which mark magnetic edges, notably faults, with good precision.

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