Originally Posted by NCSUPACK09

I work 25 miles west of DC and it lasted about 30-40 seconds. For the first 25 seconds it kind of rumbled a little bit (enough to realize that it wasn't construction on the floor below) and then it shook pretty violently for about 5 seconds (I could see the building shifting laterally back and forth) and then about another 5-10 seconds of the rumbling again. I will also note that I was on the 5th floor of my building, so I dont know if that provided me with a different experience than others in the area. BTW, I stayed at work afterwards!