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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