| Collisional mountain belts result from the closure of ocean basins and the collision of continental margins.
Folds, reverse faults, and thrusts are the consequences of a stress regime in compression where the principal stress axis s1 (sigma 1) is horizontal. The combined action of folding and faulting is responsible for the contraction and the thickening of the continental crust.
Deformation migrates from the hinterland to the forelands.
In front of the collision zone, strike-slip faults may develop to accommodate part of the convergence through the escape of lithospheric blocks in front of the collision zone.
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