Saturday's earthquake upgraded to 5.8M, strongest ever in Oklahoma
PAWNEE, Okla. (KTUL) -- The U.S. Geological Survey has upgraded Saturday's earthquake to a 5.8 magnitude -- the strongest ever recorded in Oklahoma.
According to the USGS, the magnitude revision is based on further in-depth analysis of seismic recordings.
The quake, centered about 9 miles northwest of Pawnee, was initially given a 5.6 preliminary magnitude, tying with the Nov. 6, 2011 temblor near Prague.
The Prague quake is now also being upgraded to a 5.7. The USGS says questions regarding the relative size of the two quakes prompted further analysis, which resulted in the magnitude increases.
"USGS analyses indicate that the two earthquakes are very similar in size - to within typically-cited uncertainties of 0.1 magnitude units," said Gavin Hayes, USGS research geophysicist. "However, the 2016 Pawnee event is slightly larger than the Prague earthquake in 2011."
Just after 7 a.m. Sept. 3, Oklahomans were shaken by the quake, which was also felt in more than a dozen other states in the country. A state of emergency was declared in Pawnee County where a number of homes and other buildings were damaged.
Only one injury was reported after a chimney collapsed on a man who covered his son during the shaking.
Following the quake, the Oklahoma Corporation Commission ordered dozens of disposal wells with a 725-square-mile area to shut down in the coming days.