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Meridional Orientation of Grabens and Its Bearing on Geodynamics

An analysis of lengths and strikes of continental grabens reveals a predominant north-south orientation. This is borne out both by Cenozoic grabens that have undergone little or no rotation since their formation, and by Pre-Cenozoic grabens when rotated back to their original strike. A similar predominant orientation of oceanic ridges shows that lithospheric extensional features tend to form most frequently in a near-meridional direction. This evidence should be taken into account when investigating the driving mechanisms of global tectonics.