The study done by Cliff Frohlich at the Institute for Geophysics was released Monday. It is being published in Proceedings of the National Academy of Sciences.
The Fort Worth Star-Telegram reported that Frohlich's report highlights a possible connection between seismic activity and the pumping of wastewater into underground wells. It doesn't link hydraulic fracturing, or fracking, to earthquakes.
Frohlich found 67 earthquakes within 1.9 miles of a well, more than eight times as had been reported by the National Earthquake Information Center.
In June, the National Research Council report also documented more earthquake risks near injection wells.