Recent Seismic Activity at the New Madrid Fault Concerning

By Margie Kay

A large earthquake would damage roads, bridges, and buildings

Southeast Missouri has experienced a series of minor earthquakes recently, prompting renewed interest and concern regarding the New Madrid Seismic Zone (NMSZ). While most of these tremors have been small, typically ranging from magnitude 2.0 to 3.0, they serve as a reminder of the region's potential for more significant seismic events.

According to MSN, New Madrid Fault activity has increased.  On March 25, 2025, the second largest earthquake in the region was felt by persons in Missouri and Tennesee near the boot heel. A 2.8 magnitude quake shook the area at 3:23 pm.

These recent events have sparked discussions among residents and experts alike, highlighting the importance of understanding the NMSZ and taking appropriate preparedness measures. Although scientists cannot predict earthquakes, monitoring seismic activity and studying the fault's history help in assessing the overall risk.

A Look at the New Madrid Fault's History

The New Madrid Seismic Zone is one of the most active seismic areas in the United States, east of the Rocky Mountains. It's responsible for some of the largest earthquakes in North American history.

The New Madrid Earthquakes of 1811-1812 were a series of devastating events that dramatically reshaped the landscape. These earthquakes, estimated to be between magnitude 7.0 and 8.0, caused widespread damage, altered the course of the Mississippi River, and were felt as far away as Canada. Accounts from the time describe ground fissures, uplifted land, and significant changes to the region's topography.

• Series of major earthquakes

  
  

• Estimated magnitude 7-8

  
  

• Widespread damage

  
  

• Altered Mississippi River

  
  

• Felt across a large area

  
  

The 1811-1812 earthquakes serve as a stark reminder of the New Madrid Fault's potential. While such events are rare, the possibility of future large earthquakes cannot be ignored. Scientists continue to study the fault and its behavior to better understand the risks.

Significance of the New Madrid Fault

The New Madrid Fault differs from faults like the San Andreas in California. The NMSZ is located in the interior of the North American plate, rather than at a plate boundary. This intraplate setting means that the causes of earthquakes are less understood. Seismic waves from earthquakes in the NMSZ also travel farther and affect a much wider area compared to those in the western United States.

A major earthquake along the NMSZ today could cause significant damage across several states, including Missouri, Illinois, Kentucky, Tennessee, Arkansas, and Indiana. The impact could include collapsed buildings, damaged infrastructure (such as bridges, roads, and pipelines), and disruptions to essential services.

Be Prepared to Take Care of Yourself

Emergency management will likely not be able to assist everyone, so you'll likely be on your own.

Earthquake Preparedness Tips

Being prepared for an earthquake is crucial for residents of Southeast Missouri and surrounding areas. Here are some essential tips:

• Develop a Plan: Create an emergency plan for your family, including evacuation routes and meeting points. Turn off gas to the house. Plan for no electricity, too.

  
  

• Assemble a Kit: Prepare an emergency kit with essential supplies such as water, non-perishable food, a first-aid kit, a flashlight, candles, and a battery-powered or human-powered radio. Remember medications and pet supplies
  

• Have long-term food and water plans with emergency food buckets and rain barrels. You may not be able to get food or water for weeks or months.

  
  

• Secure Your Home: Secure heavy furniture, appliances, and objects that could fall during an earthquake. Consider bolting bookcases to walls and using straps to secure water heaters.

  
  

• Stay Informed: Monitor local news and emergency alerts for updates and information.

  
  

• Practice "Drop, Cover, and Hold On:": During an earthquake, drop to the ground, take cover under a sturdy table or desk, and hold on until the shaking stops. If there's no sturdy furniture nearby, cover your head and neck with your arms.

  
  
  
  

Staying Informed and Prepared

The recent earthquakes in Southeast Missouri serve as a timely reminder of the New Madrid Fault's potential. By understanding the fault's history, its significance, and by taking preparedness measures, residents can significantly reduce their risk and improve their safety in the event of a major earthquake. Staying informed, being proactive, and working together as a community are key to building resilience in the face of this natural hazard. Review your emergency plans regularly and participate in community preparedness exercises to stay ready.