Or, of course, the M8s could be spread over 100s of years. Or, there might be a couple of M8.5s.

Change of subject: there have not been any M6+ global quakes outside of Honshu aftershocks in the last week, although a M5.9 at Tonga was close. There were M6 quakes in six different regions in the 4 or 5 days before the Japan M9

Chris