Abstract

It is shown analytically that as long as there is no lateral variation of density within a two-dimensional faulted structure the value of gravity at any point on the upward extension of the fault remains constant. Consequently, this result leads to a direct method of gravity interpretation, where it is possible to delineate the edge of such a faulted structure by continuing the surface gravity values upward to different levels and then, by using suitable numerical techniques, find the desired resulting straight-line gravity contour. The method has been verified using several theoretical models and applied to two sets of real data to demonstrate its usefulness. On a local scale, the Gloucester fault near Ottawa, Canada appears to be nearly vertical. On a larger scale, the gravity signature along the Southern Appalachian COCORP seismic profile can be explained by density jumps across a steeply dipping, major crustal discontinuity.

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