The link worked for me when I went to

http://www.freewebz.com/eq-forecasting

then typed in /128c.gif on the end on the link manually.

I suspect Roger is right that there are not enough samples, because the effect of the tides on the solid
Earth are nearly symmetric when the moon is on
the near vs far side of the Earth. The pattern is very
asymmetric.

So does this effect show up for M7-8 earthquakes
as well?

John