The magnitude 4.7 and 5.6 earthquakes that occurred on Oklahoma on November 5, 2011 have infrequent earthquakes large enough to cause minor to major damage. Late Saturday night, the area experienced the strongest earthquake ever recorded in the state. That quake followed smaller ones earlier in the day, including one at 2:12 a.m. with a preliminary magnitude of 4.7. Its epicenter was in Prague, about 50 miles east of Oklahoma City. Oklahoma typically had about 50 earthquakes a year until 2009. Then the number increased and 1,047 quakes shook the state last year, prompting researchers to install seismographs in the area.
No serious injuries were reported, but minor damage to roads and buildings was reported, according to the Sheriff’s Department in Lincoln County, the epicenter for many of the quakes. There have been dozens of aftershocks recorded following the November 5, 2011 magnitude 5.6 earthquake and its magnitude 4.7 aftershock that occurred on the same day. “We will definitely continue to see aftershocks, as we’ve already seen aftershocks from this one,” said Paul Earle, a seismologist with the U.S. Geological Survey in Golden, Colo. “We will see aftershocks in the days and weeks to come, possibly even months.”Since mid-2009, the state has had 10 times more earthquakes than normal, said Austin Holland, a research seismologist with the Oklahoma Geological Survey.
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