Hi Roger, how about as far back as you think the catalogue is complete for M4+ quakes in southern California and for M5+ quakes in Baja and Gulf of California.

Plot any quake M5+ in Gulf of California or Baja with some color scheme giving the latitude. Plot number of M4+ quakes by day in southern California south of 34 deg N, for 20 days afterwards.

Then try M6+ quakes for GOC and M5+ quakes SOCAL, but out 30 days.

If not too complicated, a color scheme for the SOCAL latitudes would help also. Just have some rainbow color scheme from 24 N to 34 N changing ever 1 deg?

This should prove whether Canie's hypothesis is plausible or imagination.

We know the big El Major quake which was mostly in Baja triggered slip on other faults in southern California.

Thanks
Chris