Click through to the US Geological Survey's website for ongoing reports of what's happening there. The last earthquake in Virginia was centered closer to Blacksburg, and was much smaller - magnitude of 2.5. If I'm not mistaken, 5.9 is about the largest Virgina has ever felt in recorded-USGS-type history. Anyone out there feel it?
[UPDATE, 11:40 AM: NPR sure did. Via Facebook: "Staff are asked to evacuate NPR’s DC buildings until we have learned more. We will continue to seek additional information. Monitor your email via mobile device outside the building and follow NPR Security instructions."]