I was waiting for articles like this! The Illinois earthquake is a 'wake up call'. Of course, if we had a felt earthquake in Toronto, I would also call it a 'wake up call'.
This earthquake happened in the fringe zone of the New Madrid system. Most likely these earthquakes are a result of stress disturbance from the main fault. In the same manner, most of our earthquakes in the lake are probably caused by the Hamilton fault, in the hanging wall.