The small earthquakes were recorded by the USGS near Greenback and Sweetwater.
The second occurred half an hour later, 1.2 miles northeast of Greenback. A magnitude 1.4 earthquake occurred at 3:23 a.m. EST, and was followed a little under an hour later by a 1.6 magnitude quake at 4:11 a.m. EST, 1.9 miles northeast of Greenback.
The final two took place in quick succession—the first, a magnitude 1.3 earthquake 1.9 miles east of Greenback at 6:06 a.m. EST and the second, a magnitude 1.6 earthquake 5 miles east of Sweetwater at 6:56 a.m. EST.The earthquakes took place on a strip of land called the Eastern Tennessee Seismic Zone , also known as the Southern Appalachian Seismic Zone, which stretches from northwestern Georgia, through Tennessee and into northeastern Alabama.
According to USGS, it is one of the most active areas in the southeastern U.S. but earthquakes here tend to be small and rarely damaging. Most are too small to be felt by anything other than a seismograph—as was the case with the five that took place yesterday. Those that do take place at the tend to be felt over a larger expanse than earthquakes that occur in western states like California, with a magnitude 4.0 magnitude in the ETSZ often being felt as far as 60 miles from where it hit.
One of the largest to strike the region was a magnitude 4.6 earthquake, which hit Fort Payne, Alabama, on April 29, 2003.
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