This is easier than you think. All you have to do is change the groundwater flow that can lubricate a fault. The former Rocky Mountain Arsenal outside Denver Colorado is a classic case. They disposed of nerve gas during the 1960's by pumping it down a deep injection well that happened to cross a fault. Earthquakes commonly followed injection events. The cause and effect were pretty obvious.

http://en.wikipedia.org/wiki/Molon_labe
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Lets not forget Greenies (Coloradans) because of the color of their license plate.

Greetings, Earth Creature. I am from the planet Lardassia.