Tidal Forces Trigger Tremors on San Andreas Fault | Wired Science | Wired.com

The same forces of attraction that cause ocean tides also cause tides in Earth’s rocks, says Amanda Thomas, a seismologist at the University of California, Berkeley. And although the continual variations in rock stress associated with those tides are minuscule, they apparently are big enough to trigger small tremors along some faults, Thomas and Berkeley colleagues Robert M. Nadeau and Roland Bürgmann report in the Dec. 24/31 Nature.
via wired.com

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