New York City

A bride in her wedding dress runs from the courthouse in Lower Manhattan in New York August 23, 2011. One of the strongest earthquakes to strike the US east coast in decades rattled offices Tuesday in downtown Washington and caused panicked evacuations from skyscrapers as far away as New York. The Pentagon, the US Capitol and Union Station in the nation's capital were all evacuated after the 5.9-magnitude quake, which was shallow with its epicenter only 0.6 miles (one kilometer) underground. The disruption to cell phone services in the hour after the quake added to the sense of panic in a country preparing to mark the 10th anniversary of the September 11, 2001 terror attacks. (credit: TIMOTHY A. CLARY/AFP/Getty Images)

New York City

A bride in her wedding dress runs from the courthouse in Lower Manhattan in New York August 23, 2011. One of the strongest earthquakes to strike the US east coast in decades rattled offices Tuesday in downtown Washington and caused panicked evacuations from skyscrapers as far away as New York.The Pentagon, the US Capitol and Union Station in the nation's capital were all evacuated after the 5.9-magnitude quake, which was shallow with its epicenter only 0.6 miles (one kilometer) underground.The disruption to cell phone services in the hour after the quake added to the sense of panic in a country preparing to mark the 10th anniversary of the September 11, 2001 terror attacks. (credit: TIMOTHY A. CLARY/AFP/Getty Images) anniversary of the September 11, 2001 terror attacks.

Washington, DC

Office workers gather on the sidewalk in downtown Washington, Tuesday, 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. (AP Photo/J. Scott Applewhite)

Baltimore

People look up at a downtown building after an earthquake was felt in Baltimore, Tuesday, Aug. 23, 2011. Downtown office buildings were cleared and workers were waiting for clearance to re-enter. (AP Photo/Patrick Semansky)

Washington, DC

Office workers gather on the sidewalk in downtown Washington, Tuesday, 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. (AP Photo/J. Scott Applewhite)

Baltimore

Co-workers Susan Sproul, left, and Susan Davidson hug after evacuating from their building after an earthquake was felt in Baltimore, Tuesday, Aug. 23, 2011. Downtown office buildings were cleared and workers were waiting for clearance to re-enter. (AP Photo/Patrick Semansky)

Washington, DC

Office workers gather on the sidewalk in downtown Washington, Tuesday, 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. (AP Photo/J. Scott Applewhite)

Philadelphia

A maintenance worker looks for additional cracked windows in a building on Market Street in Philadelphia after an earthquake was felt Tuesday, Aug. 23, 2011. (AP Photo/Alex Brandon)

Washington, DC

Pedestrians cross an intersection of downtown Washington, Tuesday, Aug. 23, 2011, after office buildings where evacuated following a reported 5.9 earthquake was felt in Washington. 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. (AP Photo/Pablo Martinez Monsivais)

Baltimore

A worker with Baltimore Gas and Electric walks past a square where workers wait for word to re-enter their office buildings after an earthquake was felt in Baltimore on Tuesday, Aug. 23, 2011. Downtown office buildings were cleared and workers were waiting for clearance to re-enter. (AP Photo/Patrick Semansky)

Baltimore

People check their phones as they wait outside of an office building after an earthquake was felt in Baltimore, Tuesday, Aug. 23, 2011. Downtown office buildings were cleared and workers were waiting for clearance to re-enter. (AP Photo/Patrick Semansky)

Washington, DC

People crowd Pennsylvania Avenue in Washington, Tuesday, Aug. 23, 2011, as they evacuate buildings after an earthquake his the in Washington area. The 5.9 magnitude 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. (AP Photo/Charles Dharapak)

Washington, DC

People use the stairs to evacuate a building in Washington, Wednesday, Aug. 24, 2011, after an earthquake hit the Washington area. The 5.9 magnitude 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. (AP Photo/Charles Dharapak)

Washington, DC

With the Washington Monument in the background people walk nearby after it was closed to visitors as a security precaution following an earthquake in the Washington area. The 5.9 magnitude 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. (AP Photo/Pablo Martinez Monsivais)

Philadelphia

People who came out on the street after an earthquake look up at a window that cracked during the quake on Market Street in Philadelphia, Tuesday, Aug. 23, 2011. A 5.9 magnitude earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island, New York City and Martha's Vineyard, Mass., where President Barack Obama is vacationing. (AP Photo/Alex Brandon)

New York City

Court officers stand outside Manhattan Criminal court building in New York on Tuesday, Aug. 23, 2011 after it was evacuated following an earthquake. (AP Photo/Mary Altaffer)

Philadelphia

Cracks appear on the facade of a building on Market Street in downtown Philadelphia following an earthquake along the East Coast Tuesday Aug. 23, 2011. A 5.9 magnitude earthquake centered in Virginia forced evacuations of all the monuments in Washington and rattled nerves from the southern state of Georgia to Martha's Vineyard, the Massachusetts island in the northeast where President Barack Obama is vacationing. (AP Photo/Jacqueline Larma)

New York City

Chopper 2 flies over Brooklyn, NY - Aug 23, 2011 (credit: CBS2)

New York City

NYPD Emergency service unit officers arrive in Foley Square in New York after the federal and state buildings that surround it were evacuated on Tuesday, Aug. 23, 2011 following an earthquake. (AP Photo/Richard Drew)

East Coast Quake

Children are evacuated from the Jacob K. Javits Federal building in New York on Tuesday, Aug. 23, 2011 after an earthquake centered northwest of Richmond, Va. was felt. (AP Photo/Mary Altaffer)

East Coast Quake

Office workers gather on a sidewalk after their building was evacuated following an earthquake in New York on Tuesday, Aug. 23, 2011. (AP Photo/Mark Lennihan)

East Coast Quake

NYPD Emergency service unit officers arrive in Foley Square in New York after the federal and state buildings that surround it were evacuated on Tuesday, Aug. 23, 2011 following an earthquake. (AP Photo/Richard Drew)

East Coast Quake

People stand in Foley Square after being evacuated from federal and state buildings surrounding it in New York on Tuesday, Aug. 23, 2011 following an earthquake. (AP Photo/Mary Altaffer)

East Coast Quake

People use their Blackberry mobile devices in Foley Square after being evacuated from the federal and state buildings that surround it in New York on Tuesday, Aug. 23, 2011 following an earthquake. (AP Photo/Mary Altaffer)

East Coast Quake

People stand in Foley Square in New York after being evacuated from the Federal and State buildings that surround it Tuesday, Aug. 23, 2011. The 5.9 magnitude 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. (AP Photo/Richard Drew)