Saturday's earthquake upgraded to 5.8M, strongest ever in Oklahoma

A 5.8 magnitude earthquake was recorded Sept. 3 in the Pawnee area. (KOKH/FILE)

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.

RELATED: Couple of 50 years loses home in Pawnee quake

"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.

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