There were just M6.0, 6.2, and 6.0 quakes within a 1 hour period respectively N Island New Zealand, East Coast Honshu (aftershock), and Cuba region. These jump out on the list (link) because M6+ are colored Red; if any are downgraded to M5.9 it won't jump out as much. Coincidence? See thread farther down where Roger used data to show no relation for this sort of pattern before M8, 8.5, or 9 quakes. A couple of years ago he showed no relation between distant M6 quakes with each other.
Chris

• 3 M6 quakes in an hour