Earthquakes risk in Louisiana

Earthquake Characteristics in Louisiana

Louisiana is rated Level 1 (very low) on the earthquake hazard scale used by FEMA and the National Risk Index. This means the state is among the least likely in the U.S. to experience strong ground shaking from an earthquake. The hazard level is based on the probability of ground shaking strong enough to cause damage, and Louisiana’s geology—deep, soft sediments and the lack of major active fault lines—keeps the risk low.

Most earthquakes in the region are small and rarely felt. The state is not associated with a major seismic zone like the New Madrid Seismic Zone to the north, which affects states such as Missouri, Tennessee, and Kentucky. However, Louisiana’s proximity to that zone means a very large earthquake there could produce weak tremors felt in parts of northern Louisiana. The USGS notes that the New Madrid zone has generated major earthquakes in the past, but the probability of a repeat in any given year is extremely low.

There are no specific earthquake seasons. Unlike hurricanes or tornadoes, earthquakes occur at random times. In Louisiana, the more pressing natural hazards are flooding, hurricanes, and severe storms. For most residents, the earthquake threat is negligible compared to those risks.

In terms of geographic exposure, the entire state is uniformly low. Areas along the Mississippi River and the Gulf Coast have soft soils, which can amplify shaking in the rare event of a distant earthquake. But because the hazard is so low, no region in Louisiana stands out as particularly at risk.

How It Affects Homes

Given the very low earthquake hazard, most homes in Louisiana are not designed specifically for earthquake resistance. Building codes in the state focus mainly on wind and flood loads, which are far more relevant. In the unlikely event of a moderate earthquake, typical property damage could include:

• Cracks in drywall, plaster, or masonry foundations
• Shifting or settling of foundations on soft soil
• Toppling of unsecured furniture, water heaters, or heavy objects
• Broken glass from windows and mirrors
• Damage to chimneys or brick veneer

Severe structural collapse is not expected at this hazard level. The main risk is from secondary events, such as fires caused by ruptured gas lines or water damage from broken pipes. Because earthquakes are rare, most homeowners do not purchase earthquake insurance. In Louisiana, standard homeowners policies do not cover earthquake damage; a separate endorsement or standalone policy would be needed. Given the low risk, this type of coverage is rarely cost-effective for residents.

In the aftermath of an earthquake, the more likely hazards would be disrupted utilities and fallen objects. Preparedness for earthquakes should be part of a general home emergency plan, but it should not distract from preparing for the state's more common hazards like hurricanes and flooding.

How to Prepare Your Home

Even with low risk, taking a few simple steps can improve safety. The following mitigation measures are recommended by Ready.gov and FEMA for any home, regardless of earthquake risk:

• Secure heavy furniture, such as bookcases and cabinets, to wall studs using brackets or straps.
• Anchor appliances like water heaters, refrigerators, and gas stoves to prevent shifting.
• Install latches on kitchen cabinets to keep doors closed during shaking.
• Place heavy or breakable items on lower shelves.
• Know how to shut off your gas and water supply valves, and keep a wrench nearby.
• Repair any deep cracks in foundations or walls before they worsen.
• Store flammable liquids and chemicals in secured, spill-proof containers away from ignition sources.
• Create a family emergency plan with a meeting place and an out-of-state contact.
• Assemble an emergency kit with water, food, flashlights, batteries, and a first-aid kit.

These steps also help prepare for other disasters, so they are worthwhile even in a low-hazard state. For more detailed guidance, consult the resources listed below.

Frequently Asked Questions

Can a large earthquake in the New Madrid zone affect Louisiana?

Yes, a very large earthquake in the New Madrid Seismic Zone could generate tremors felt in parts of Louisiana, especially the northern half of the state. However, the USGS estimates that the probability of such an event in the next 50 years is low, and the shaking would likely be minor—similar to passing a heavy truck. Louisiana’s soft soils might amplify the shaking slightly, but damage would be minimal.

Are there any active fault lines in Louisiana?

Louisiana is located on the passive continental margin of the Gulf of Mexico, and there are no major active faults in the state. Some small faults exist, and minor earthquakes have been recorded, but they are generally too small to be felt. USGS data shows that the state has a very low rate of seismic activity compared to California, Alaska, or even Oklahoma.

Does my homeowners insurance cover earthquake damage?

No, standard homeowners insurance policies in Louisiana do not cover earthquake damage. Coverage is available as a separate policy or endorsement, but given the very low hazard level, it is typically not a priority. If you have concerns, ask your insurance agent about the cost and whether it fits your situation. More important is ensuring you have flood insurance, which is a much bigger risk in Louisiana.

Official Resources

• Louisiana Governor's Office of Homeland Security and Emergency Preparedness
• USGS Earthquake Hazards Program
• Ready.gov – Earthquakes
• FEMA Earthquake Safety