Chris;

Actually, I did 6+ first.

Anyway here's 6+ compared to 8+, 8.5+ and 9+ main quakes

8.0+ 39 cases 0 13 8 17 11 12 8
8.5+ 6 cases 0 2 2 3 2 2 1
9.0+ 1 case 0 0 0 1 1 0 0

The 7 numbers are the number of mag 6+ quakes 1000km+ away from the main quakes for days 0 thru 6 prior to the main quake.

Roger