The Monday morning aftershock was at least the 15th since Friday's quake.
Strong aftershock reported Monday in Illinois
WEST SALEM, Ill. 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 5 1/2 hours later.
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