Orthorhombic fault patterns: The odd axis model and slip vector orientations

摘要: Conjugate fault theory cannot explain all observed patterns of faults and slip vectors. New models suggest that orthorhombic represent the general, three-dimensional strain case relegate conjugate faulting to special plane strain. The odd-axis model relates geometry principal orientations ratios. also predicts vectors for faults, expressed as rake vector on plane. Assuming one is vertical, steeply or shallowly raking developed under fields with relatively small magnitudes ofintermediate Oblique-raking possible only where relative magnitude intermediate large. has been tested five sets data from Utah, Nevada, Israel Crete. Predicted lie close in cases. suggests are reactivated a field, may match those prior episode be distinctly different orientation, producing bimodal patterns, seen parts Basin Range province. This last observation strains have played significant role development.