A 4.1-magnitude earthquake occurred 7 miles west-northwest of Edgefield, S.C., Friday night, giving residents a light trembling in the Covington/Conyers area. The quake occurred around 10:23 p.m.
According to the U.S. Geological Survey, earthquakes have been recorded in the Inland Carolinas region since at least 1776 and in adjacent parts of Georgia and Tennessee. Most of the quakes have been small and caused little damage.
Residents' comments on Facebook showed little alarm about the mild shaking, with several saying they felt the quake but weren't sure what it was.
The USGS website includes the following information about earthquakes in the Inland Carolinas region: Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as 10 times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).