That's what these people think, and now put all the action on the Wabash. Apparently there is some seismic monitoring there, and larger earthquakes have been located there recently.
Personally, I don't think 'Old Lady Madrid' is totally finished, for the young turks to take over. She is the active mechanism, the side faults are only a side show! Perhaps they can work themselves up to a 6, but that's it. Of course, Chicago would be even more surprised with a 6 barking at its door!