The Oklahoma Oil & Gas Association seeks an injunction and a ruling that counties lack authority over oil-field wastewater.
Federal agency is also examining safety equipment and crew training, communication and experience.
After Texas rejection, utility pulls the plug on nation’s largest wind farm under construction in Oklahoma
Researchers may have found deep, previously unmapped faults that could be a source of Oklahoma’s earthquake uptick
Scientists have linked thousands of earthquakes to oil-field disposal wells, but new research helps explain why much of the shaking doesn’t line up with maps of known faults.