From Neil DeGrasse Tyson's Facebook post (http://www.facebook.com/#!/neiltyson):
"SuperMoons? A hoax spread by the under-educated on the under-informed claiming the Moon causes quakes. Saturday's full Moon is also closest to Earth in its oval orbit. Perigee happens once per month. Full Moon+Perigee coincide every 2 or 3 years. Last one: Dec 2008. Size? Saturday's moon is 7% larger than average. The difference between a 15 & 14-inch pizza. You are now better informed than the Press."