OGS research seismologist Austin Holland said continued analysis of the survey data showed the epicenter was about 8 miles southeast of Norman, south of Lake Thunderbird near E Post Oak Road and 84th Avenue SE. Initial reports rated the 9:06 a.m. quake as magnitude 4.5 or 4.3, but Holland said further analysis showed a consistent magnitude of 5.1.
I think people really want to pump up their local earthquakes. :)
ps. Right under an artificial lake. Could this be water related?