Magnitude-4.5 earthquake rattles Midwest

Temblor is reportedly the 15th aftershock since Friday's 5.2 earthquake

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updated 8:16 a.m. ET April 21, 2008

WEST SALEM, Ill. - The U.S. Geological Survey said early Monday that it recorded one of the strongest aftershocks so far from Friday’s Illinois earthquake.

Geologists say the temblor just before 12:40 a.m. Monday 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 5.2-magnitude earthquake, which was followed by a 4.5 magnitude aftershock about 5½ hours later.

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The Monday morning aftershock was at least the 15th since Friday’s quake.