I'm not sure that there is a map of one, but I know that I am smack-dab under one. If the New Madrid fault were to fracture, it is expected that New Madrid, MO would feel a 8.0; Memphis, TN would feel a 6.0, and I would feel a 5.0; and that it could be felt as far away as Boston. I have my camera setting on my desk at all times for a reason!
Speaking of which, it's coming up on the 200th anniversary of the 1811-1812 series of earthquakes, which is why a lot of people around here are predicting a quake.