Close to the surface rocks fault in response to applied stresses because of the high strain rates. Deeper in the crust, as the strain rate decreases, the rocks flow and instead of fracturing they develop ductile shear zones

Close to the surface rocks fault because rock composition controls its response. Deeper in the crust, rock composition changes becoming more mafic and such rocks respond in a ductile fashion. The case shown in the figure has dextral movement

Close to the surface rocks fault because the composition of rocks in shallow crust are more prone to fracturing. Deeper in the crust, rock composition changes becoming more mafic and such rocks respond in a ductile fashion. The case shown in the figure has sinistral movement

Close to the surface rocks fault forming a sharp plane that allows for lateral displacement. Deeper in the crust, as the temperature and pressure increase, the rocks flow and instead of fracturing they develop ductile shear zones. The case shown in the figure has dextral movement

Close to the surface rocks fault in response to applied stresses because of the low temperature and low pressure. Deeper in the crust, as the temperature and pressure increase, the rocks flow and instead of fracturing they develop ductile shear zones. The case in the figure has sinistral movement.