Panel admits fracking caused two earth tremors
Fracking – full name induced hydraulic fracturing – is the creation of fractures in rocks by pressurised fluid.
Such fractures can be a natural phenomenon but fracking is used to release petroleum and gas by drilling a bore into rock formations.
The practice is widely used in the USA, where supporters point to the huge amount of previously inaccessible hydrocarbons which the process can extract. Objectors point to potential environmental impacts, including contamination of ground water, deterioration of air quality, and the migration of gases and hydraulic fracturing chemicals to the surface. The authorities in the States are conducting a study into fracking's impact on drinking water and ground water resources.
Earlier this year, a Government-appointed panel said the method which triggered two earth tremors near Blackpool last year should continue, although with strict controls.
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