At least a dozen moderate magnitude earthquakes shook northern Oklahoma and southern Kansas on Saturday and into early Sunday.

The most powerful was  a 4.5 magnitude quake that was recorded by the U.S. Geological Survey at 5:03 p.m. Saturday about one mile northwest of Cushing, Oklahoma. It followed a 4.4 magnitude quake recorded at 4:20 a.m. about 18 miles southwest of Medford, Oklahoma, and about 100 miles northwest of Cushing.

Emergency management officials report no significant damage and no injuries. Cushing is where the world’s most important crude oil storage hub is located and it is used to settle futures contracts traded on the New York Mercantile Exchange.

The U.S.G.S. also reports a 3.7 magnitude quake about 13 miles southwest of Medford at 10:20 a.m. and a 3.0 magnitude temblor one mile northwest of Cushing at 5:20 p.m. There was also a magnitude 2.9 earthquake recorded at 7:53 a.m. five miles east of McLoud in central Oklahoma.

Early Sunday three more earthquakes shook near Stillwater, Perry, and Helena, Oklahoma. Those measured 3.7, 3.1, and 2.6.

The earthquakes were felt across a large portion of Oklahoma and Kansas.