This is in a new cluster. Note the more rugged national forests, since I believe these are along the 'spine' of the megathrust. OK is such a mess now with disturbed stress that perhaps there won't be another big one. Who knows?
Afterthought: It's quite possible that with lots of injection that this will resemble the Toronto pattern, with the major fault under Ok City, and a disturbed hanging wall to the east. I expect that things will remain fractal up to M6 or M7. That is, the usual curve of 10 M3's for an M4, etc.