Three small earthquakes have been recorded in northern Oklahoma during the weekend.
The U.S. Geological Survey reports the strongest was a magnitude 3.1 quake recorded at about 7:20 a.m. on Sunday.
It was six miles east of Medford.
The agency also recorded a magnitude 2.7 quake six miles south-east of Waukomis.
And there was a magnitude 2.7 temblor near Helena at 10:22 p.m. on Saturday.
No injuries or damage were reported.