Opposition fighters flashed the V-sign for victory during celebrations in Tripoli's newly named Martyrs Square, formerly known as Green Square, on Tuesday (Aug. 23, 2011). Filippo Monteforte/AFP/Getty Images hide caption

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Office workers gather on the sidewalk in downtown Washington, Tuesday, moments after a 5.8 magnitude tremor shook the nation's capital. J. Scott Applewhite/AP hide caption

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People reach for their cellphones outside the courthouse in Manhattan after an earthquake rattled the East Coast on Tuesday. Nicholas Kamm /AFP/Getty Images hide caption

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People check their smartphones while standing in the street shortly after an earthquake struck Washington on Tuesday. Mandel Ngan/AFP/Getty Images hide caption

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