5.9 Earthquake hits DC

Sitting in the office, on 15th and K, we just experienced the building shake which triggered the fire alarm. More on this later.

Update: CNN reports that the preliminary estimate was a 5.8 earthquake. Attached is a logo of the USGS map of the quake. Our editor Stephen Smith quips: “Well we found our lede!”

Update 2: Fox News reports that the U.S. Capitol, the Pentagon and other buildings were evacuated. Pictures in the Capitol building reportedly fell from the walls. 

Update 3: Quake upgraded to a 5.9; details below:

Magnitude 5.9
Date-Time
  • Tuesday, August 23, 2011 at 17:51:03 UTC
  • Tuesday, August 23, 2011 at 01:51:03 PM at epicenter
Location 37.975°N, 77.969°W
Depth 1 km (~0.6 mile) (poorly constrained)
Region VIRGINIA
Distances
  • 6 km (4 miles) SSE (152°) from Louisa, VA
  • 6 km (4 miles) SW (236°) from Mineral, VA
  • 26 km (16 miles) SE (133°) from Gordonsville, VA
  • 66 km (41 miles) NW (318°) from Richmond, VA
  • 134 km (83 miles) SW (219°) from Washington, DC
Location Uncertainty horizontal +/- 10.9 km (6.8 miles); depth +/- 7.4 km (4.6 miles)
Parameters NST=390, Nph=390, Dmin=57.9 km, Rmss=1.17 sec, Gp= 47°,
M-type=regional moment magnitude (Mw), Version=6
Source
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event ID usc0005ild

 

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