Oklahoma has twins!

That's right, OK now has two mechanisms.  I always wondered about that upper zone, and now the latest M3.7 is strong thrust.

I think we shall call it a smaller mechanism, but still good for at least a 6

This is the exact mechanism I would expect for the larger thrusts.  There are almost no 'felt reports' since everybody is sick of them, but the MMI 4 is expected.  If anybody would talk about it, it would probably be 'explosive'.  They really can't rely on felt reports any more, and should put in wide dynamic range seismometers.