Many seismologists believe that large scale flooding can put more weight on the plates and thus cause Earthquakes. Many believe that huge storm surges also can do the same thing. It makes sense because water weighs a lot and when lots of it moves the plates would too right? Sure, no problems there. But what if there is even more too this; what if water resonance changes can cause changes enough to cause Earthquakes too?
Now then lets also remember that resonance changes things too. And when the Moon is full and there is weight on the plates we could in fact increase the potential for seismic shifts; Earthquakes. Some do predict this, noting tidal surges and some believe it is the increase in gravity affects, with more power to the moon and a little less from the Sun. Some have even gone so far as to say the Earth