Officials in Lafourche and Terrebonne parishes say they do not have an answer, but they are still trying to figure out what happened this week after getting several reports of "earth tremors".

A man who lives nearby in Lockport, says that he felt what he thought was a sudden vibration of the earth at his home Wednesday afternoon.

Chris Boudreaux, Lafourche's director of Emergency Operations, says they have checked out things like sonic booms from airplanes, and vibrations from oilfield activity, but so far they have no concrete answers for residents.

Boudreaux says when they checked with the U.S. Geological Survey they had no reported seismic activity.

Paul Caruso, a geophysicist with the Geological Survey's National Earthquake Center, says Louisiana is not known for much seismic activity.