"The past 24 hours have had an uptick in earthquake numbers, with 8 quakes ranging from 2.6-4.2 magnitude occurring in Oklahoma," USGS tweeted.
USGS described last night's 4.2 quake as "widely felt" in the city of Edmond and northern Oklahoma City.
An earthquake at that magnitude feels like a "heavy truck striking building," the agency explained on its website.
The temblor caused power outages for more than 4,600 electricity customers in north Edmond. The power was completely restored by 11 p.m. local time.
Edmond's police department reported no significant damages from that earthquake, but many locals and households were shaken up.
Oklahoma City resident and KWTV meteorologist Cassie Heiter tweeted, "That was the biggest earthquake I've ever felt. Never want to experience that again."
The Associated Press reported that at least six earthquakes with a magnitude 3.0 or greater have struck the central part of the Sooner State since Tuesday.
The Midwestern state is not previously known for seismic activity. Before 2009, Oklahoma felt two earthquakes per year. But in 2014, the numbers jumped to about 2,500 in 2014, 4,000 in 2015 and 2,500 in 2016.
In September 2016, a magnitude 5.8 earthquake—the state's largest ever recorded—struck near the town of Pawnee.
The state has seen a drop in earthquakes this year, likely due to regulations in wastewater disposal activity.
The Oklahoma Corporation Commission's Induced Seismicity Department and the Oklahoma Geological Survey are investigating the recent Edmond-area earthquakes. The commission also said that no disposal wells are in the area but a known fault is in the vicinity.