5.8 earthquake rocks East Coast

Office workers scramble out of buildings after a 5.8-magnitude tremor, centered near Richmond, shook the Washington area.

Office workers gather on the sidewalk in downtown Washington on Aug. 23, 2011, moments after a 5.9 magnitude tremor shook the nation's capitol. The earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island and New York City. (Associated Press)

Office workers gather on the sidewalk in downtown Washington on Aug. 23, 2011, moments after a 5.9 magnitude tremor shook the nation's capitol. The earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island and New York City. (Associated Press)

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