A 5.6-magnitude earthquake rattled Oklahoma on Saturday, damaging buildings and tying for the strongest temblor ever recorded in the state, which has experienced a rash of earthquake activity in the past decade that U.S. seismologists have tied to the underground disposal of wastewater from oil and gas drilling.

Oklahoma Gov. Mary Fallin said via Twitter on Saturday afternoon that state regulators were contacting operators of 37 disposal wells in a 500-square-mile area and asking them to shut down following the quake.

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