Studies of the relative motions of the Pacific and North American plates have shown that only about 75 percent of the motion can be accounted for in the movements of the San Andreas and its various branch faults.
Os estudos dos movementos relativos das placas do Pacífico e norteamericana indicaron que só un 75% do movemento pode ser explicado polos movementos da falla de San Andreas e as súas ramificacións.