Though the main concerns of most anti-fracking activists continue to be the devastation to water quality, community health issues, and the role hydraulic fracture drilling plays in planetary global warming, a new study reveals that the practice can also have much larger impacts on another dangerous phenomenon: earthquakes.

It’s not news that gas drilling causes small, localized tremors around fracking sites, but new research presented by one of the top seismology labs in the world on Thursday shows how “swarms of minor earthquakes”—as Reuters reports—can lead to subsequent and larger ones with much more dire consequences.

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