I guess there's a fault line along the James River or something. There was an earthquake nearby during the summer too, but I didn't feel it at my house (100 miles west of Richmond), so I'm guessing it was a lot smaller.
Funny thing is, I was joking around with my out-of-state friends that the only thing we were missing this semester was an earthquake, considering we had a hurricane and a tornado within a week of each other. I figured since there just was one, we wouldn't likely have one anytime soon.
I was wrong I guess.