An update as of 1:45pm from the AP:

THE U.S. GEOLOGICAL SURVEY SAYS A 5.9 MAGNITUDE EARTHQUAKE CENTERED NORTHWEST OF RICHMOND, VA., SHOOK MUCH OF WASHINGTON, D.C.  THE SHAKING WAS FELT AS FAR NORTH AS THE MARTHA'S VINEYARD, MASS., GOLF COURSE WHERE PRESIDENT BARACK OBAMA WAS JUST STARTING A ROUND.  THE GEOLOGICAL AGENCY SAYS THE EARTHQUAKE, WHICH STRUCK AT 1:51 P.M. EDST, WAS HALF A MILE DEEP AND WAS CENTERED NEAR LOUISA, VA.  PARTS OF THE PENTAGON, WHITE HOUSE AND CAPITOL WERE EVACUATED.  THERE WERE NO IMMEDIATE REPORTS OF INJURIES.  THE EAST COAST GETS EARTHQUAKES, BUT USUALLY SMALLER ONES AND IS LESS PREPARED THAN CALIFORNIA OR ALASKA FOR SHAKING.  AT REAGAN NATIONAL AIRPORT OUTSIDE WASHINGTON, CEILING TILES FELL DURING A FEW SECONDS OF SHAKING.  AUTHORITIES ANNOUNCED IT WAS AN EARTHQUAKE AND ALL FLIGHTS into and out of reAgan AND BALTIMORE BWI AIRPORT WERE PUT ON HOLD

As of 1:35: The USGS is now putting the quake at a 5.9, centered around Mineral, VA... That's about 100 miles south of Washington.

There are reports of the earthquake being felt as far north as New York and Manhattan... And as far south as North Carolina.

ABC News is reporting that several buildings in Washington have been evacuated... Including the White House, the Capital, Pentagon, and State Department.

Heres an update as of 1:35pm from AP:

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 AND NEW YORK CITY.

             THE QUAKE SENT HUNDREDS OF PEOPLE SPILLING INTO THE STREET A BLOCK FROM THE WHITE HOUSE, WITH OTHER BUILDINGS EVACUATED IN NORTH CAROLINA AND TREMORS FELT AS FAR AWAY AS NEW YORK CITY.

             THE U.S. GEOLOGICAL SURVEY SAID THE EARTHQUAKE WAS 3.7 MILES DEEP. SHAKING WAS FELT AT THE WHITE HOUSE AND ALL OVER THE EAST COAST, AS FAR SOUTH AS CHAPEL HILL, N.C. PARTS OF THE PENTAGON, WHITE HOUSE AND CAPITOL WERE EVACUATED. THE QUAKE APPEARS TO HAVE BEEN CENTERED IN MINERAL, VA., WHICH IS IN LOUISA COUNTY.  THERE HAVE ALSO BEEN REPORTS OF TRIMMORS FROM AS FAR AWAY AS GEORGIA.

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