The San Andreas Fault is a sliding boundary between the Pacific and North American plates. It cuts California into two pieces from Cape Mendocino to the Mexican border. It is a transform fault. The plates slowly move past each other, a couple inches a year. For a few years the plates will be locked in place and won't move and push against each other. The build up strains and breaks the rock along the fault. The breaking rock sends waves in all directions. The waves feel like the waves from an earthquake. In places like Carrizo Plain and the Olema Trough you can easily see the fault as scraps and pressure ridges.
http://geology.com/articles/san-andreas-fault.shtml
ARIEL
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