This June, 2014, photo provided by the University of Colorado shows graduate student Jenny Nakai looking at data from seismographs in Weld County in northern Colorado. Nakai is the lead author of a study that found more evidence linking earthquakes
This June, 2014, photo provided by the University of Colorado shows graduate student Jenny Nakai looking at data from seismographs in Weld County in northern Colorado. Nakai is the lead author of a study that found more evidence linking earthquakes in another area on the Colorado-New Mexico border to wells that inject wastewater from oil and gas production back underground. (Anne Sheehan/University of Coloradovia AP)
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