More than 2.7 million people in Illinois and other parts of the Midwest participated in an earthquake drill Thursday morning.
Organizers say the annual drill is a reminder earthquakes can hit the most unlikely places.
201 years ago Thursday, two major earthquakes hit the central U.S., including Illinois.
More than 80 Chicago schools participated in the drill.
If you find yourself in an earthquake, drop to the floor, take cover under sturdy furniture and hold on until the shaking stops.
Schools, businesses, government agencies, families and others can register to participate in the drill at: www.shakeout.org
Additional information about the earthquake risk in Illinois and steps to take before, during and after an earthquake is available at: www.Ready.Illinois.gov