A seismograph on Skidaway Island detected the July 29 earthquake in Russia, over 5,500 miles away from its origin point.

What we know: The earthquake struck about 25 miles north of Augusta, Georgia, in Edgefield, South Carolina, according to the U.S. Geological Survey. That's about 130 miles east of Atlanta.

Two tremors struck in December 2018. One was a 4.4 magnitude earthquake that was centered in Decatur, Tennessee, which is south of Knoxville. It shook homes as far away as Atlanta.