More than two dozen earthquakes shook northwest Oklahoma late Wednesday and early Thursday, with the two biggest happening less than a minute apart just before 10:30 p.m.
The big quakes were felt over a wide area, including Wichita, Kan., Tulsa, Oklahoma City, Del City and Norman.
The first earthquake happened at 10:27 p.m. and was reported as measuring magnitude 4.3. It was centered 19 miles northwest of Fairview, or 47 miles west of Enid, according to U.S. Geological Survey. It was upgraded later to 4.7.
The second was stronger, measuring magnitude 4.8. It happened at 10:28 p.m. and was centered 14 miles south-southeast of Alva, or 40 miles west-northwest of Enid. It was the strongest quake recorded in Oklahoma this year, and was bigger than the two largest recorded in the state last year. Those were a pair of magnitude 4.7 temblors in northwest Oklahoma in November.
Two magnitude 3.4 quakes followed.
The first hit at 10:37 p.m. 20 miles south of Alva, or 46 miles west of Enid. The second hit at 10:49 p.m. 18 miles northwest of Fairview, or 46 miles west of Enid.
A magnitude 3.3 quake then hit at 11:19 p.m. 15 miles north-northwest of Fairview, or 39 miles west of Enid.
All were recorded at a depth of about 3.1 miles, except for the 4.8, which was about 4.3 miles deep, according to USGS.
More were recorded in the same general area overnight, including a 4.0.