- Associated Press - Friday, July 17, 2015

HELENA, Okla. (AP) - Parts of northern Oklahoma have been shaken by an earthquake.

The U.S. Geological Survey says a 3.8 magnitude quake was recorded at 7:30 a.m. Friday about 10 miles west-southwest of Helena in Alfalfa County. Geologists say the quake was recorded at a depth of about two miles.

No injuries or damage was immediately reported.

Geologists say earthquakes of magnitude 2.5 to 3.0 are generally the smallest that are felt by humans and damage is not likely from earthquakes below magnitude 4.0.

The Oklahoma Geological Survey has said it is likely that some earthquakes in the state are being triggered by the injection of wastewater from oil and natural gas drilling operations.

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