Earthquakes in Missouri

While not as frequent as in other parts of the country, earthquakes pose a significant threat to Missouri—especially due to the New Madrid Seismic Zone, one of the most active fault systems in the United States outside the West Coast. This fault runs through southeast Missouri and has the potential to produce damaging earthquakes felt across much of the central U.S.

About Earthquakes

An earthquake is the sudden shaking of the ground caused by the release of stress along fault lines beneath the Earth’s surface. While the shaking itself can be intense, most injuries result from falling objects, structural collapse, or debris.

Earthquakes can also trigger landslides, fires, flooding, and—in coastal areas—tsunamis.

The New Madrid Seismic Zone

The New Madrid Fault System extends roughly 120 miles through southeast Missouri into northeast Arkansas. It averages over 200 small earthquakes annually, with some felt locally. Historically, the region experienced major quakes in 1811–1812, estimated to be magnitude 7.5–8.0, affecting much of the eastern United States.

A moderate earthquake (magnitude 6.0 or greater) occurs in this region about every 80 years; a major quake (7.5 or greater) occurs every 200–300 years. The consequences of such an event could include widespread structural damage and major economic losses—upward of $6 billion in Missouri alone.

Earthquake Safety

During an Earthquake

Indoors:

  • Drop, Cover, and Hold On: Take cover under sturdy furniture or near an interior wall. Protect your head and neck. Stay away from windows and heavy objects.

  • Do not run outside: Most injuries occur near building exteriors from falling debris.

  • Stay indoors until shaking stops.

Outdoors:

  • Move away from buildings, trees, and power lines.

  • Kneel or sit down to avoid being knocked over.

In a Vehicle:

  • Pull over safely away from bridges, overpasses, and power lines.

  • Stay inside with your seatbelt on until the shaking stops.

After an Earthquake

  • Expect aftershocks.

  • Check yourself and others for injuries.

  • Avoid using elevators.

  • Inspect for hazards: gas leaks, electrical damage, structural concerns.

  • Only use flashlights for light—avoid open flames.

  • Assume all downed power lines are live.

  • Limit phone use to emergencies.

  • Tune into local emergency radio stations such as KMOX 1120 AM or KWRE 730 AM for updates.

  • If utilities are damaged, shut off the main valves and seek alternative shelter.

Stay Informed

 

Warren County residents are encouraged to sign up for CodeRED to receive real-time emergency alerts, including earthquake updates. Visit WarrenCountyEMA.com or contact our office for assistance.