Study ties oil and gas production to earthquakes in Midwest

A big jump in small earthquakes across the nation's mid-section is "almost certainly man-made," scientists report. Still, researchers could not say exactly how oil and gas production could be triggering the quakes.
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A big jump in small earthquakes across the nation's mid-section is "almost certainly man-made," scientists report. Still, researchers could not say exactly how oil and gas production could be triggering the quakes.

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