"An earthquake struck northern Oklahoma early Saturday morning, rattling houses and waking residents in the region around Pawnee, about 74 miles north of Oklahoma City. Preliminary measurements show the quake had a magnitude of 5.6 — believed to be one of the strongest in state history.
The quake was felt in five states, according to the U.S. Geological Survey: Oklahoma, Kansas, Missouri, Arkansas and Texas. It struck just after 7 a.m. local time, at a depth of 6 kilometers (3.7 miles).
The epicenter was around 8 miles northwest of Pawnee, a town of less than 3,000 people. Shortly after the large quake hit, at least four additional temblors struck the same area, with the strongest having a magnitude of 3.6; all of them were shallower than the first quake."