Eastern Georgia and especially South Carolina have been the sites of numerous small, and a few very big earthquakes over the past few centuries.
An 1886 quake in Charleston, S.C. killed scores of people, did tremendous damage and was felt as far away as Boston, Bermuda, Chicago and Cuba.
Here are some details on last night's tremor. Here are some more maps.
And here is some information about the history of earthquakes in Georgia.