Last weekend's Oklahoma earthquake was state's largest on record

The U.S. Geological Survey upgraded the magnitude of the earthquake that rattled Oklahoma on Saturday to 5.8, making it the strongest ever recorded in the state's history.

The previous record for an earthquake in Oklahoma was the Nov. 6, 2011, quake that hit Prague, which was also updated Wednesday from a magnitude 5.6 to 5.7.

Questions surrounding the size of both earthquakes prompted the events' re-analysis, Gavin Hayes, a USGS research geophysicist, said in a statement. The data indicates while the two quakes are extremely similar in size, the most recent event is slightly larger, he added.

Shaking from the Saturday quake, centered in rural Pawnee County, could be felt over a seven-state area.

Gov. Mary Fallin said Saturday that three homes in Pawnee County were damaged by the quake and that at least three buildings in the city of Pawnee sustained some level of damage. An inspection of state highway and turnpike bridges also turned up "very minor issues," she said.

The magnitude revision is based on further in-depth analysis of seismic recordings, the USGS said. Changes in estimated quake magnitude are common in the days after the event as more data are analyzed in greater detail than possible in the first minutes after the earthquake, the agency added.

An increase in magnitude-3.0 or stronger earthquakes in Oklahoma has been linked to underground disposal of wastewater from oil and natural gas production.


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