We had ~ 5.0 in the Detroit area in 1986. The house shook, the cups and glasses in the cupboard rattled. A lady friend was at the house at the time and we just looked at each other like "what the hell just happened?"
If NM gives way like it did in 1811-1812 ...
Don't laugh. We had a mini tsunami on Lake Michigan a couple years back, sent water almost a half mile inland. Not seismic, but weather related.
Even though Sparta is 600 miles away from New Madrid, could it be that it's getting ready let loose?