There have not been many earthquakes since 1945 in this region. Below is a map that shows the largest earthquake as a M = 5.4 earthquake from 1998.11.26. Here is the USGS query that I used to create this map. This is the first page that I posted about the M 2.9 earthquake. I also threw in the 1992 Petrolia earthquake in for good measure. Faults and fault zones are labeled. There are also some ghosted moment tensors that show the general relative plate motion across some fault zones.
In 1998, there was a M 4.5 earthquake that was followed in November by three earthquakes.