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.
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A family of four is recovering from carbon monoxide poisoning in Tulsa, EMSA officials confirmed Thursday evening.
With temperatures forecast to drop over the next few hours and days, area shelters are urging homeless people to come indoors.
Construction workers continue to face challenges performing job duties when temperatures drop.