Pennsylvania environmental regulators say there's a likely correlation between a natural gas company's fracking operation and a series of minor earthquakes in western Pennsylvania last year.
They revealed their findings Friday. The quakes were recorded in April, about 50 miles north of Pittsburgh and within a mile of a natural gas well owned by Houston-based Hilcorp Energy Co.
They were too weak to be felt by humans and no damage was reported. The company stopped fracking at the well pad after the quakes.
A Hilcorp spokesman said Friday it has no plans to resume activities there and continues to work with the state and monitor for any related concerns.
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Fracking has been tied to earthquakes in Ohio and elsewhere, but never in Pennsylvania, the nation's No. 2 natural gas-producing state.