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The 2004 LaSalle County, Illinois earthquake was a 4.2 magnitude earthquake that occurred on June 28, 2004 at 01:10:51 a.m. CDT (06:10:51 a.m. UTC) and affected Northern Illinois and five other Midwestern states. Its epicenter was located 2 mi south of Prairie Center, 8 mi east of Troy Grove, and 8 mi north-northeast of North Utica, Illinois. The quake's intensity was rated as category VI on the Modified Mercalli Intensity Scale, and could be felt as far away as Olive Branch, Mississippi, Fort Myers, Florida, and Palisades, New York.

The quake occurred 5 km beneath the surface in a structure associated with the Sandwich Fault Zone. It was not connected with the New Madrid Fault farther south, which has been linked to the Midwest's most serious earthquakes. The earthquake was felt in six different states, Illinois, Indiana, Iowa, Michigan, Missouri and Wisconsin. No fatalities were reported, yet thousands of people were startled and awoken in the middle of the night. Three nearby nuclear power plants — LaSalle, Quad Cities, and Dresden — issued low-level alerts, but no damage was found.

The earthquake was the first within the LaSalle County area since the 4.0 magnitude earthquake on September 15, 1972, near Amboy, Illinois, in neighboring Lee County, to the northwest. The last recorded earthquake within the county, prior to 2004, was on June 27, 1881, when a 4.6 magnitude quake hit near the city of LaSalle, Illinois.