Well from what I read Solar Energy (CME) in addition to the energy or pull from the Full Moon can have or trigger seismic events...Something I have been reading about with the increase of earthquakes and incoming solar energy
The full, and new moon periods exert a more extreme pull on the earth, and in addition to more extreme high and low tides, I believe there are more earthquakes and volcanoes at such times. By the way, right on schedule with the full moon be have significant eruptions in Guatemala and Ecuador:
http://news.yahoo.com/s/ap/20100529/ap_on_re_la_am_ca/lt_guatemala_volcano