Residents in Tennessee and Georgia were jolted on Saturday morning by an earthquake with a preliminary magnitude of 4.1, according to the U.S. Geological Survey.

The earthquake had its epicenter just outside of Greenback, Tenn., a town of about 1,000 people, but it was felt as far away as Atlanta.

The last time a strong earthquake was felt in the region was 2018, when a 4.4 magnitude tremor rattled houses but caused little damage.

As seismologists review available data, they may revise the reported magnitude of Saturday’s earthquake.

The area, known as the Eastern Tennessee Seismic Zone, extends across Tennessee into northwestern Georgia and northeastern Alabama. Minor earthquakes occur annually, but the zone is not known to have major tremors.

This is a developing story.