Subtitle San Andreas -

(on the west) is moving northwest relative to the North American Plate (on the east).

Programs like ShakeAlert now provide precious seconds of warning to residents before the strongest shaking arrives. subtitle San Andreas

The San Andreas is a , meaning two tectonic plates are sliding past each other horizontally. (on the west) is moving northwest relative to

In places like the Carrizo Plain , the fault trace is so clear from the air it looks like a furrowed field. subtitle San Andreas