There was a case over here before christmas of a fracking test site near a place called Blackpool allegedly causing two minor quakes. The north-west of England isn't renowned for it's seismic activity, but I have not heard anything more about the case, so don't know if it was just coincidence or not. I would tend to think it was, just because small quakes DO happen occasionally, and these were not really out of the ordinary magnitude-wise.