Editor's note: A previous version of this story mistakenly said wells within a 500-square-mile radius would be shut down. It's actually a 500-square-mile area.
State regulators tell disposal well operators in a 500-square-mile area around Saturday's Pawnee earthquake to shut down their wells.
Matt Skinner with the Oklahoma Corporation Commission says that order impacts about 35 wells.
The U.S. Geological Survey reports the quake struck at 7:02 a.m. about nine miles northwest of Pawnee.