LOUISA, Va. (AP) -- Since an earthquake rattled central Virginia and the East Coast nearly two years ago, more than 450 aftershocks have been recorded by the U.S. Geological Survey.
The latest occurred Wednesday when a magnitude-2.3 quake struck about 6 miles south-southwest of Louisa. The survey says the area is within the central Virginia seismic zone, which has been identified for decades as an area of elevated earthquake risk.
The magnitude-5.8 earthquake that rocked the East Coast in August 2011 startled tens of millions of people as for north as Canada and damaged schools and houses in the Virginia epicenter.
The USGS says up to one-third of the U.S. population could have felt the quake -- more than any other in U.S. history.
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