WEST SALEM, IL - The U.S. Geological Survey says it has 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 five 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-and-a-half hours later.
The quake was felt in several states in the New Madrid fault zone, including Arkansas and Missouri.
The Monday morning aftershock was at least the 15th since Friday's quake.