Jane...let us know how the prediction comes out. Even with few predictions, it is hard for me to keep track. Also, you could ask Roger to check your pattern by means of some graphs...not quite sure the best way to approach looking visually at this sort of a pattern...I suppose date on one axis, longitude on the other, and size of symbol for magnitude...done over a period that you would suggest (how long have you have been noticing this?) If this has been going on for 2 years, Roger might graph it for 2 years, or maybe for five. But, up there Roger might not be able to have a complete catalogue for small quakes....

I would not rule out what you think you are seeing being interesting/significant....,maybe its a little slip event like happens every 14 months in Pac NW? Except smaller and different?
Chris