MEDFORD, Okla. (AP) -- Seven earthquakes have rattled Oklahoma, including a 3.8-magnitude temblor that struck near the town of Medford.
The U.S. Geological Survey reports that the 3.8 quake hit Saturday around 2:40 p.m. Four of the seven quakes occurred near the town of Langston and had magnitudes of 3.5, 3.2, 2.9 and 2.6.
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The final two hit Saturday near the towns of Perry and Cherokee.
No injuries or damage were immediately reported.
Oklahoma's earthquakes have been linked to the injection of wastewater underground from oil and gas production and state regulators have recommended reducing the volume or shutting down some of the disposal wells.
According to the survey, Oklahoma this year has already had more than 90 earthquakes of magnitude 3.0 or greater, which is generally when most people start to feel them.
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