David Friedman offers a more optimistic reading of the otherwise terrifying phenomenon:
The energy for an earthquake has to come from somewhere, and I don't think the amount of energy that goes into pumping water underground can be close to enough. What is presumably happening is that pumping in the water causes the release of energy that is already there. Dissipating that energy might mean lots of small earthquakes instead of a small number of big ones, which would probably be a net benefit. If so, what has been identified is not a bug but a feature.
The Dish 