My chair began to rock me...UPDATE!

...a few minutes before 1 PM (CDT), first gently, then a pause, and then the rocking was a bit more substantial for about 30 seconds.

Perhaps it's due to the less than 5 magnitude quake in Virginia?

For more info, go to http://www.usgs.gov/

UPDATE: 5.9 earthquake in Va, Felt in NYC


Read more here.