Finding faults in geological data is disclosed. One example is a system where input geological image is received. A semblance analyzer generates a semblance metric at each point of the image, the semblance metric being indicative of local semblance analysis. A tensor field extractor extracts a structure tensor at each point of the image, the structure tensor being indicative of local structure in the image. A phase congruency filter provides a stick tensor at each point of the image, the stick tensor based on the semblance metric, and being indicative of a point lying on a major edge in the image. An evaluator evaluates, at each point of the image, a fault tensor based on the semblance metric, the structure tensor, and the stick tensor, the fault tensor being indicative of a likelihood of each point lying along a potential fault in the image.
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