http://www.dur.ac.uk/dei/news/?itemno=14448
Professor Richard Davies, Director of Durham Energy Institute, Durham University, said: “Based on our observations, we believe that it may be prudent to adopt a minimum vertical separation distance for stimulated fracturing in shale reservoirs. Such a distance should be set by regulators; our study shows that for new exploration areas where there is no existing data, it should be significantly in excess of 0.6 km.”
This means that fracking must not be allowed in Leitrim or Fermanagh! Directly underneath the fracking zone is the Ballyshannon limestone, which is an aquifer.