We have 3 small earthquakes in the US, none of which we can blame on injection (maybe). The first is an M2.8 right in the middle of the OK aftershock zone.
The next 2 are in the middle of the New Madrid mess, which could be considered aftershocks of the big one. I like to think they are part of the next quake, but they are interesting only if they extend the zone.
Like I've said, more earthquakes extending the line to Dyersburg would be infinitely more interesting.