Abstract
The fault pattern in the Vredefort collar is explained, in part, by a mechanical model using the theory of hollow cylinders. Centripetal movement of the collar along bounding concentric faults appears to have generated concentric, horizontal maximum principal stresses within the collar rocks which, in turn, have produced the observed primary and secondary fault patterns in the western, northwestern and part of the northern arcs of the collar. Most of the northern arc, however, does not have a fault pattern which conforms to this model but this may be explained if the Vredefort structure is open to the south.
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