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.

Ronald Reagan National Airport Police stop travelers from entering Terminal A, Tuesday, Aug. 23, 2011, as authorities checked for damage after an earthquake in the Washington area. A 5.9 magnitude earthquake centered in Virginia forced evacuations of all the monuments on the National Mall in Washington and rattled nerves from Georgia to Martha's Vineyard, the Massachusetts island where President Barack Obama is vacationing. No injuries were immediately reported.  (AP Photo/Cliff Owen)

Ronald Reagan National Airport Police stop travelers from entering Terminal A, Tuesday, Aug. 23, 2011, as authorities checked for damage after an earthquake in the Washington area. A 5.9 magnitude earthquake centered in Virginia forced evacuations of all the monuments on the National Mall in Washington and rattled nerves from Georgia to Martha's Vineyard, the Massachusetts island where President Barack Obama is vacationing. No injuries were immediately reported. (AP Photo/Cliff Owen)

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