WEST SALEM, Ill. (AP) - A strong aftershock shook Southern Illinois on Monday, three days after a magnitude 5.2 quake rattled the region.

Geologists say the temblor just before 12:40 a.m. registered at 4.5 magnitude at its epicenter about 5 miles northwest of Mount Carmel. The location is in the same area as Friday's early-morning earthquake, which shook a wide area of the Midwest and caused minor damage.

The Monday morning aftershock was the second strongest recorded since Friday, according to the U.S. Geological Survey Web site. The strongest was a 4.6 magnitude shaker about 5 1/2 hours after the original quake.

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On the Net:

Geological Survey: http://www.usgs.gov

(This version CORRECTS that Friday's strongest aftershock was 4.6 sted 4.5.)