earthquake

This afternoon I was in a meeting when someone else said the room was shaking. I hadn't noticed but did after she pointed it out. I figured it was a large truck rumbling by outside; she said it felt like an earthquake ("but smaller", I said). Who knew that a magnitude-5.0 earthquake on the border of Ontario and Quebec could be felt in Pittsburgh?

The coworker, it turns out, used to live practically on top of the San Andreas fault and is sensitized.