The 2.7 magnitude earthquake recorded in Mascot late Saturday night has been upgraded to a 3.0, according to USGS.
The quake occurred near 11:12 p.m. and had a depth of 22.4 kilometers or 12 miles.
The epicenter was recorded at east Knox County near the Jefferson County line.
Witnesses in the cities of Mascot, Blaine, and South Knoxville reported hearing a rumbling like thunder.
USGS said the quake occurred in the East Tennessee Seismic Zone, which extends across eastern Tennessee into northwestern Georgia and northeastern Alabama.
The agency also said this is one of the most active earthquake areas in the Southeast, and around 120 earthquakes too small to be felt are recorded each year.
10News will keep you updated as more information becomes available.