This picture has information about the Lake Arthur Fault that runs alongside Lake Peigneur. It continues through the Magnolia salt dome at Bayou Corne/Napoleonville and continues on as the Frenier Fault toward Lake Pontchartrain.
The yellow blobs are salt domes ↓
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MORE: EVIDENCE OF NEOTECTONIC ACTIVITY IN SOUTHWEST LOUISIANA – a thesis
In this paper on p. 30 it concludes on topic of causes of fault movement . . .
. . . Now who do we know who would be DUMB ENOUGH TO EXTRACT A LOT OF GROUNDWATER ON A FAULT??
Hmmm. . . . who could that be??