A shallow-dipping reverse fault in the ground which terminates before it reaches the surface. When it breaks, therefore, it may produce uplift, but never any clear surface rupture. There are many still-unknown blind thrust faults which may exist in southern California. Two examples of known blind thrust faults: the Elysian Park Thrust, which runs underneath downtown Los Angeles and the Northridge Thrust Fault, which ruptured in the 1994 Northridge earthquake.