John-I agree-I was logging on now to qualify what I said about significance with your previously-posted idea about distances between active areas. It will be too bad if no one can pursue the time-scrambled comparison. I don't have time or skill at programming to do this (I can program, but it takes me 10 to 100 times as long as someone who programs more often than once every few years).

Possibly one easier way for Roger to see if the FFA relation is a trigger vs seismically-active areas would be to slightly modify his program so that aftershocks within, say, 30 days are excluded, and you look for aftershocks between, say, 200 and 214 days, and see if there are big peaks......sound like a good test John? Sound like something you would enjoy doing Roger? Chris