Oblique Relay Ramps

Oblique view of top surface of scaled clay model of basement-involved oblique-slip faulting. The clay was deformed as a fault system propagated upward from a rigid basement block into the clay. Bright features are synthetic fault scarps dipping toward the base of the image; dark features are antithetic fault scarps dipping away from the base of the image. Although the basement fault is one continuous fault, the fault system in the cover consists of several segments arranged in an echelon geometry, with very well developed relay ramps between the overlapping synthetic segments. The originally circular passive markers have been deformed into faulted strain ellipses in the fault zone. The experimental models were run at Mobil Technology Company by Martha Withjack and Gloria Eisenstadt.