OKLAHOMA CITY - A 5.6 magnitude earthquake has rocked central Oklahoma, rattling buildings across a wide area and a stadium where a football game had just concluded, but authorities said they had no immediate reports of injuries or major damages.

The quake was a latest in a series of quakes to hit the state in a 24-hour period, including a 4.7-magnitude quake early Saturday.

Michelann Ooten, a spokeswoman for the Oklahoma Department of Emergency Management, said no injuries were reported to emergency management officials and she had no reports of major damages.

The US Geological Survey reported from Golden, Colo., on its website that it monitored a 5.6 magnitude quake at 10:53 pm local time Saturday and said it was centered about 44 miles east-northeast of Oklahoma City. It had initially reported the temblor as a 5.2 magnitude quake.

If the initial reading of 5.6 magnitude holds, the quake would be the state's strongest on record. A magnitude 5.5 earthquake struck El Reno, just west of Oklahoma City, in 1952 and another of about that magnitude struck in northeastern Indian Territory in 1882, according to USGS records.

In Stillwater, a college football game had recently ended Saturday night when the quake shook a stadium as Kansas State played at Oklahoma State.

In Muskogee, retired advertising and public relations executive Robert Rhea said he felt his home rocking for about 15 to 20 seconds.

"Oh man, it just about shook this old man out of his TV chair," said Rhea, 70, speaking with The Associated Press by telephone. He said nothing broke in his home but the state was on edge after being rattled by lesser quakes during the day.