Hydraulic fracturing operations like this one near Mead, Colorado, have been blamed for a surge in earthquakes, but the U.S. Geological Survey says most of the shakes are not caused by fracking. (Associated Press)
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Hydraulic fracturing operations like this one near Mead, Colorado, have been blamed for a surge in earthquakes, but the U.S. Geological Survey says most of the shakes are not caused by fracking. (Associated Press)
