Roger
Not necessarily. it is like Full Moon and New Moon criteria.All full Moon and New moon does not give major quakes and all major quakes are not necessarily on these Moon phases.
Roger one thing can be done ,to check combination
1)Find planets changing the direction(Jupiter ,Saturn ,Venus and Mars).there will be approx 8 such dates in a year
2)15 days before and after these dates will give 8 months ie 250 days
3)In each of these months there will be
one full Moon One New Moon and two Neap tide moon ie ---4 days
two extreme declinations----- --------2 days
Four Moon aspects (0,90,180 and 270 degrees) of Moon
with planet changing direction-------------------------4 Days
one Moon at perigee ----- ---- -------- -----1 day
-----------11 days
11 days* 8 = 88 days say 90 days.Here no window period ,only one date

we need to find out (may be a software is required)

Now total major quakes (6.5+) occurred in these 90 days vis a vis whole year may give some what correct combination of all triggers
regards
Amit

• http://earthquakeprediction.webs.com