Louisville, Kentucky – A rare Midwest earthquake early Tuesday is now drawing attention across Kentucky as a surge of Arctic air pushes temperatures sharply lower, creating conditions that could lead to frost quakes during the coldest overnight hours.
According to the U.S. Geological Survey, a 3.5 magnitude earthquake struck central Illinois shortly before 2 a.m. Tuesday, centered about 35 miles south of Springfield. The shallow quake was felt across a wide portion of Illinois, with thousands reporting shaking and loud rumbles before sunrise. While no damage was reported, earthquakes of this size are uncommon in the region, making the event notable as extreme cold spreads south and east.
As the deep freeze reaches Kentucky, geologists say rapid temperature drops can trigger frost quakes, also known as cryoseisms. These occur when moisture in the ground freezes suddenly, causing soil and rock to contract and fracture. The resulting boom or vibration can feel like a small earthquake and may rattle homes, especially late at night or before dawn.
Central and western Kentucky, including Louisville, Lexington, Bowling Green, Owensboro, and areas near the Ohio River Valley, may be more susceptible as temperatures plunge following recent rain or wet ground conditions. Rural areas and locations near foundations, roadways, and underground utilities can be especially vulnerable. Frost quakes are shallow and localized but can crack pavement, foundations, and pipes.
State emergency officials emphasize that frost quakes are not tied to fault lines and do not signal larger earthquakes. Residents are encouraged to remain alert during the coldest periods, inspect property if shaking is felt, and report loud booms or ground movement to local authorities or the USGS. With dangerous cold expected to persist through midweek, additional advisories or alerts may follow as conditions continue to evolve.
