[...] John Boudreaux, director of the parish Office of Homeland Security and Emergency Preparedness, said experts suggest that Tuesday’s burp happened as a result of some movement of the earth under the sinkhole’s surface. [...]
Boudreaux said before the sinkhole disgorged the material, the water level dropped by about 6 inches and then returned to its original level. The size of the water level change was based on measurements of hydrocarbon rings left on trees. [...]
“It’s just the natural course of events as this sinkhole follows its natural life,” [Texas Brine Company, LLC's spokesman] said. [...]
The coinciding long-period tremor, which Boudreaux said lasted about four minutes on Tuesday, is of a variety in the Bayou Corne area that researchers at the University of Memphis Center for Earthquake Research and Information previously have attributed to the movement of underground gas or liquids.
[...] Boudreaux said the latest instance produced more material than in the past. [...]