The U.S. Geological Survey said that quake, about 2:30 p.m. Tuesday, was of magnitude 3.0 and centered 21 miles south-southeast of Enid. The researchers said one at 6:30 p.m. was magnitude 3.2 and another one just before 7:40 p.m. was of magnitude 3.5. Those were centered just north-northwest of Enid.
Quakes lighter than magnitude 3.0 are usually not felt by people.
A swarm of quakes struck the same area in July.