An earthquake was recorded by the US Geological Survey (USGS) under Manchester, Oklahoma early Friday, with Oklahoma and Kansas residents reporting the event on social media.
Seismograms picked up the earthquake at 7:57 a.m., with reports coming in from Tulsa and Wichita on Twitter that the ground was shaking.
The quake was originally registered at 4.5 magnitude (on the Richter Scale) but was then downgraded to a 4.2 by the USGS.
Officials have said they are still studying the data and may make changes to their findings as they get further information.
Various reports have the quake clocked between 4.5 and 5 magnitude.