Laws of physics hold true even if we do not understand them. (originally from Mysteries of the Multiverse)
From:
http://www.msn.com/en-ca/weather/topstories/can-an-active-hurricane-season-lead-to-an-increase-in-earthquakes/ar-AAsugbv?li=AAacUQk&ocid=spartandhp
Air pressure can cause seismic waves.
If you remember; I postulated such a cause many years ago.