The U.S. Geological Survey has reported a 3.4 magnitude earthquake that occurred at 7:41 p.m. Friday evening, about 6 miles north of Fairfield, IL, which is located southeast of Greenville.
So far no damage has been reported.
That part of southern Illinois is in the Illinois Basin of the Ozark Dome region, which borders the much more seismically active New Madrid fault zone. The USGS says frequent earthquakes occur at irregular intervals throughout the region.
The largest earthquake recorded in that region was a 5.4 magnitude quake in 1968.