Active scarp

Wrightwood, California--a place famous among geologists, at any rate! Wrightwood is in the San Gabriel Mountains near the east end of CA State Route 2, right on the trace of the San Andreas Fault. The proximity of the fault has led to oversteepened slopes of shattered rock, as seen here, which regularly generate huge debris flows, especially during El Niño floods. A great deal of effort has been expended to try to channel the flows. Telephoto view; map location is of the scarp rather than the camera.