Self-determining numerical modeling of compressional fault-bend folding

We present the application of the HCA (hybrid cellular automata) numerical modeling technique to the evolution of compressional fault-bend anticlines involving layers that have competency contrasts and a mechanical stratigrap hy. The new modeling results show that, for competent hanging-wall layers, (1) the fault style is not preserved in the overlying fold; (2) fold develo pment is not self-similar, and rotational growth wedges develop in the fore limb when syntectonic sedimentation occurs; and (3) balanced fault-bend ant iclines can develop for ramp cutoff angles as high as 60 degrees. These res ults compare favorably with field examples and laboratory analogues and dra matically broaden the applicability of fault-bend folding to model the evol ution of thrust-related anticlines.