The San Andreas Fault runs straight up the middle, from
San Bernardino County toward Los Angeles County on the horizon.
The mountain ranges are formed by the Pacific Plate colliding into the North American Plate, right here, on this boundary. The 2 mountain ranges are also headed northwest. Here we are looking at the one section of the famous fault where a collision is actually taking place, because this is where the fault bends west before heading north again.
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