The Oklahoma Corporation Commission says two oil and gas wastewater injection wells are shutting down and one is reducing operations in the Crescent area following several earthquakes.
The commission said Tuesday that Stephens Production and Devon Energy are each voluntarily closing one well. Also, Stephens is reducing operations at another well by 50 percent.
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Earthquakes in the area recorded by the U.S. Geological Survey on Monday and Tuesday include two of magnitude 4.5 and one of magnitude 4.1.
The commission recently announced plans to place more than 200 disposal wells under scrutiny as it investigates whether they are triggering earthquakes in the state. An Oklahoma Geological Survey report in April says it's "very likely" most of the state's recent earthquakes were triggered by the injection of wastewater from the wells.