A 5.6 magnitude quake shook Oklahoma shortly after 7 a.m. Saturday, and its effects were felt all the way in St. Louis.
According to the United States Geological Survey, the 5.6 quake struck at 7:02 a.m. about 14km northwest of Pawnee, Oklahmona, which is about 55 miles from Tulsa.
Viewers from both sides of the state line in the St. Louis metro area reported feeling the quake.
A magnitude 3.6 aftershock was recorded at 7:58 a.m. just outside original quake's epicenter south of Ponca City.
The magnitude 5.6 earthquake ties for the record of strongest quake ever recorded in Oklahoma. The state was struck by another 5.6 quake in Prague, Okla., on November 5, 2011.
The last significant earthquake that struck the St. Louis metro area was a magnitude 5.4 in West Salem, Ill., in April 2008.
Missouri is no stranger to seismic activity as the New Madrid Seismic Zone runs through the southeast corner of the state. Though it's known for producing smaller earthquakes, geologists predict the possibility for larger quakes in the future.