The Arkansas Oil and Gas Commission has voted unanimously to ban disposal wells for unconventional gas drilling wastes in a region that has been inundated with earthquakes. The decision requires the immediate closure of one disposal well and prohibits the construction of new wells in a 1,150 square-mile radius. Operators have also closed an additional three disposal wells on their own initiative, the Associated Press reports.
Earthquakes have become unusually common in some areas of Arkansas where increased unconventional gas related drilling is taking place. Residents insist that there is a correlation between the quakes and the area’s wastewater disposal wells. After monitoring hundreds of earthquakes, the largest a magnitude-4.7 in February, investigators began confirming the connection.
The Oil and Gas Commission discovered that four disposal wells were situated on a fault line responsible for dozens of earthquakes this year alone. As reported by the Associated Press, “after two of the four stopped operating in March, there was a sharp decline in the number of earthquakes. In the 18 days before the shutdown, there were 85 quakes with a magnitude 2.5 or greater, but there were only 20 in the 18 days following the shutdown, according to the state Geological Survey.”