Too bad these geologists in Michigan don't study Canada much. We have these all the time. If you cross-cut them, you find that a highly-stressed layer of limestone buckled and popped up. I can't find a single stupid picture of them outside of the paywall, but we did a ton of work on them.
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So what you are saying is that this is a small localized phenomenon that doesn't register as seismic activity, but is still a shift in the area bedrock?
It would still register on nearby seismometers (if they existed), but it would be like a small blast. If you trench it, the rock would only be disturbed down to a few metres.
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