From the NASA website.
QUOTE: We asked geophysicist Paul Lundgren of NASA’s Jet Propulsion Laboratory in Pasadena, California, to do a scientific shakedown on the matter. In order to make any connection between climate and earthquakes, says Lundgren, you first have to determine what kinds of tectonic processes might be related to climate phenomena. Scientists know earthquakes can be triggered or inhibited by changes in the amount of stress on a fault. The largest climate variable that could change fault stress loads is surface water in the form of rain and snow. Lundgren says several studies have supported such correlations. But there’s a catch.
There have been several studies. You have to google them, but essentially events on the surface can effect the substrata depending on what they are.
