Good one Baylor, I meant to make that point as well. Northern Italy, in fact most of Italy, is tectonically very active, the stresses built up by these forces will far out weigh the forces induced by fracking. However, some caution does need to be exerted as there is the potential for injection of water to release those forces if not done carefully. Some research was done in the states on this a number of years ago following earthquakes generated as a result of water injecting by the US Army, it was unintentional and I can't remember why they were doing it, possibly some form of aquifer storage/artificial recharge scheme perhaps. It did give people the idea that it could be used to 'lubricate' fault lines allowing lots of smaller earthquakes to release the pressure on faults like the San Andreas with the result that the massive earthquakes would be less likely. Nice idea in theory but hasn't been taken any further forward as far as I am aware, probably due to the fact that no body wants to be responsible for levelling large chunks of LA and San Francisco if they get it wrong!
M