The Southern Appalachian Seismic Zone, a seismic region stretching from northwestern Georgia, through Tennessee and into northeastern Alabama, was hit by a swarm of 5 earthquakes on February 11, 2020. The same area was struck by the seventh strongest quake in East Tennessee in more than a century on January 20, 2020.
The five tremors occurred within 5 hours. Four of them were clustered around Greenback and one hit near Sweetwater. They were all under M2.0:
- M1.7 @ 2:48 a.m. EST, 3 miles east of Greenback
- M1.4 @ 3:23 a.m. EST, 1.2 miles northeast of Greenback
- M1.6 @ 4:11 a.m. EST, 1.9 miles northeast of Greenback
- M1.3 @ 6:06 a.m., 1.9 miles east of Greenback
- M1.6 @ 6:56 a.m. EST, 5 miles east of Sweetwater
Meanwhile, another M2.7 earthquake hit near Fincastle at 11:33 a.m. EST on February 12, 2020, which was reported by at least 40 people on the USGS homepage.
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