Felt in Montgomery County, MD. (just north of DC) House started shaking, I thought it was a train passing at first, until it didn't stop... and got stronger.

Felt in Montgomery County, MD. (just north of DC) House started shaking, I thought it was a train passing at first, until it didn't stop... and got stronger. I was on the phone with my wife, an hour away in MD driving this way, and she felt it at the same time. We knew it was pretty big at that point (she's a geologist so she would know anyway)