Wallace Creek is a small stream , draining into Soda Lake , that remains dry most of the year . It drains perpendicular to the San Andreas Fault , and the creek bed is currently offset by due to the movement of the fault . About of the displacement was created during the 1857 Fort Tejon earthquake . The current segment began forming 3,700 years ago . Sometime between 1540 and 1630 A.D. , the creek was offset by about feet in an even larger earthquake
1857 Fort Tejon earthquake
1857 Fort Tejon earthquake
Carrizo Plain