On Tuesday, August 23, 2011 at 1:51 pm, a 5.8-magnitude earthquake occurred 38 miles outside of Richmond, Virginia. It was one of the strongest earthquakes to hit the East Coast in 60 years. And today, people are still talking about the quake that shook much of the East Coast, caused damage to the Washington Monument and even unnerved some Chicago residents. No fatalities have been reported, but the scare has unearthed renewed concerns about our safety during a potential "big one" and the impact it may have. Suzan van der Lee, a seismologist at Northwestern University, joins us on Chicago Tonight at 7:00 pm to discuss the earthquake.