Nothing much has been happening in the US. I understand there was an earthquake in James Bay, but Canada has the worst earthquake maps ever, and I don't do much with them. They are happier that way.
If the larger faults were being activated, I would expect the pattern to fill in. These are probably just local clusters caused by single injection wells. As I stated earlier, if we want this to be a new-New Madrid, we need the NE and NW lines to fill in. Then a new NE line from the town of Romance. I'll let you know when this happens!