The map shows historic seismicity
And it appears to be fairly active. I'm looking for a good tectonic map to get an idea of what the setting is like, not being familiar with the geology of that area. But the interior of continents are not actually that stable. Consider the New Madrid area of Missouri, which still holds the record for the biggest quake in america since the 1700's. Also, most of Canada is rebounding from the removal of the ice sheet 10,000 years ago, that process isn't always smooth.