I compared every 6.5+ magnitude earthquake listed at USGS since 1973, with the 90 lunar eclipses that occurred during the same period, and found that large earthquakes are more likely to happen within a day of a lunar eclipse (the day of the eclipse, the day before and the day after).
The spreadsheet is here:
(there's two tabs - the data, and where I got the data from)
1720 earthquakes of 6.5+ magnitude in 14031 days equals 1 in every 8.15 days
45 earthquakes of 6.5+ magnitude from within one day of 90 eclipses, from 270 days = 1 in every 6
Could I be onto something? Could the gravitational tug-of-war which is surely at its strongest during a lunar eclipse, be enough to trigger some earthquakes?