Challenge #4.4 - Where in the World is the Gross Family?

So, in case you haven't heard, an earthquake hit northern Virginia this afternoon! It was very exciting (well, sort of... as exciting as three minutes of rumbling can be), so I'm using that as my excuse for not posting earlier. And don't worry family, Gena can't answer this one! I say that with all the love in the world for Gena, and a great big thanks for her submission of the following picture.

Your clue: This location is not traditionally in an earthquake zone, but it has felt it's fair share of aftershocks over the years. As a matter of fact, there were reports of residents feeling tremors from today's earthquake even though this location is close to 700 miles from the epicenter. The last earthquake to hit this location directly was in 1947, but even though it was the largest reported, the magnitude was not recorded.