ALVA, Okla. (AP) -- The U.S. Geological Survey says a 3.7-magnitude earthquake hit northwestern Oklahoma on Monday morning.
The USGS says the quake was recorded at 9:17 a.m. about 20 miles south of Alva in Woods County. The earthquake was recorded at a depth of about 3 miles.
There were no immediate reports of damage or injuries.
Geologists have concluded that some earthquakes in the state have likely been triggered by the injection of wastewater from oil and natural gas operations. The number of earthquakes with a magnitude of 3.0 or greater has risen in Oklahoma from a few dozen in 2012 to more than 900 last year.
Last week, the Oklahoma Corporation Commission instructed producers to reduce injection volumes by more than 500,000 barrels a day in a 5,200-square-mile area of northwest Oklahoma.
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