UK firm admits shale gas work caused tremors

Reuters: UK unconventional gas explorer Cuadrilla Resources on Wednesday said shale gas exploration work probably triggered minor earthquakes at its drill site near Blackpool in northwest England earlier this year. "It is highly probable that the hydraulic fracturing of Cuadrilla's Preese Hall-1 well did trigger a number of minor seismic events," a report commissioned by the company said. The tremors were triggered by pumping vast quantities of water at high pressure 3 kilometers underground through......

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