Given that the geological structures found beneath the ground are the result of dynamic processes and not of intentional design, they are not always as stable as they could possibly be. In some cases, the disturbance caused by the injection of high pressure water jets designed to fracture rock could cause them to collapse. This is apparently what happened at a fracking site near Blackpool, in England. This is not simply the pet theory of some fringe environmental group trying to pin the blame for a natural phenomenon on a company performing operations that they vigorously object to. In fact, it was the fracking company itself, Cuadrilla Resources, who announced after an investigation that, “It is highly probable that the hydraulic fracturing of Cuadrilla’s Preese Hall-1 well did trigger a number of minor seismic events.”
The company went on to say that it was “due to an unusual combination of geology at the well site coupled with the pressure exerted by water injection as part of operations,” and that “this combination of geological factors was extremely rare and would be unlikely to occur together again at future well sites.”
But despite this last claim, the US Geological Survey recently announced findings indicating that fracking operations may have been responsible for as many as 50 earthquakes in Oklahoma last January.
read at source
- Quakes in Okla.: ‘Fracking’ to Blame? (abcnews.go.com)
- Does fracking cause earthquakes? (americablog.com)