I was on 13th floor of my office Downtown Stamford around 1:54pm felt something like &quot;a heavy person walking down the hall&quot; outside the room I was sitting in!  The whole floor kind of bobbed waved up and down slightly.  Nothing in the room moved - but the sensation rolled right through it.

The PC monitors the ladies in the office use were all wobbling on their stands, and they heard crackling sounds(probably ceiling tiles shifting&quot;.