Reuters:
Shale gas exploration triggered small earthquakes near Blackpool in northwest England earlier this year, UK firm Cuadrilla Resources said, adding to concerns about the safety of a technology that is transforming U.S. energy markets.
A spokesman said on Wednesday tremors were triggered by pumping vast quantities of water at high pressure 3 kilometers underground through drill holes in a process known as hydraulic fracturing, or fracking, which is designed to prop open shale rocks and release trapped gas.
"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.
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