Louisiana is known for hurricanes, flooding, and even the occasional winter snow. But earthquakes are rarely part of the state’s natural hazard conversation.
That may be changing.
Researchers say 16 earthquakes have been recorded in Louisiana since December, including a 4.9-magnitude quake near Alexandria that was strong enough to prompt a scientific investigation funded by state and federal grants.
Tulane researcher Dr. Cynthia Ebinger is part of the team studying the recent seismic activity.
“The Earth is constantly shifting in subtle ways,” Ebinger said. “Most of the time we don’t feel those movements, but when activity reaches a certain level, like the earthquake recorded near Alexandria, it becomes something we need to study.”
According to Ebinger, Louisiana sits on geologic formations that were once far more active.
“Millions of years ago there were active faults in this region,” she said. “Over time they became quiet, but some of the activity we’re seeing now suggests those faults may be awakening again.”
Despite the recent tremors, Ebinger says areas like New Orleans are unlikely to experience noticeable earthquakes under current conditions as long as those conditions don't change."
"Lets say other states have learned that human activity can shake things up." she said.
She also notes there is a known fault line along the north shore of Lake Pontchartrain which does produce activity but not enough for folks to feel, meaning the possibility cannot be completely dismissed.
For now, scientists say residents shouldn’t worry.
Although Louisiana may have experienced a record snowstorm last year, along with hurricanes, tornadoes, and waterspouts, earthquakes remain low on the list of concerns.
Researchers will continue monitoring the recent seismic activity as they work to better understand what’s happening beneath the state’s surface.