I throw this up every year or so. You'll notice the influence of the two megathrusts under Lake Ontario. The gap between Hamilton and Cleveland is due to a huge Precambrian basin, shown in the reflection seismic. The Hamilton fault is strongly defined. These earthquakes continue to show a strong affinity to water, and are generally at a fraction of the rate of Oklahoma. The rare earthquake (1 in 500) is a 6+. The 'destructo' is an M7. This class of earthquake is strongly shown in the sediments.