Photo: Mysterious "Swarm" of Quakes Strikes Oregon Waters

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Colored dots show the earthquake "swarm" that struck waters off the shore of Oregon beginning in March 2008.

Scientists are now planning a marine expedition (black line) to help unravel what is causing the mysterious temblors, which were detected by a Cold-War-era system of underwater microphones originally designed to track Russian submarines.

Image courtesy of NOAA Vents Program / Oregon State University CIMRS Program

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