"Tim Baker, director of the commission's Oil and Gas Conservation Division, said the central Oklahoma plan, like the northwest one, will reduce the total volume of wastewater by 40 percent below the totals from 2014," Monies writes. "The volume reduction plan will be phased in over two months, with full compliance expected by May 28."
Oklahoma had more earthquakes in 2015—more than 900 of magnitude 3.0 or higher—than the combined total of every state except Alaska. Prior to the oil and gas boom of 2009, Oklahoma averaged two earthquakes of magnitude 3.0 or higher per year. This year more than 200 earthquakes of magnitude 3.0 or higher have been recorded, including seven of magnitude 4.0 or higher, Monies writes. "The central Oklahoma plan covers more than 120 operators."