How faults generate earthquakes
Because it is a crack or fracture it would easily move for it is unsteady and will have a higher possibility to cause an earthquake., , "earthquakes occur on faults. A fault is a thin zone of crushed rock separating blocks of the earths crust. When an earthquake occurs on one of these faults, the rock on one side of the fault slips with respect to the other. ... The fault surface can be vertical, horizontal, or at some angle to the surface of the earth.",