BAYOU CORNE — Work near northern Assumption Parish’s sinkhole resumed Saturday after seismic activity forced a work stoppage Friday, the Assumption Parish Police Jury said.
The Office of Conservation advised that monitoring of the sinkhole and the failed salt cavern believed to have caused it, known as Oxy 3, was lowered back to Code 1 — meaning work inside and around the sinkhole could resume, the Police Jury reported in a Saturday blog post.
“The rate of subsurface activity being detected by seismic monitoring is reduced in the area around the sinkhole and Oxy 3 area, and the waters of the sinkhole have not shown further signs of movement at surface,” the post says.
John Boudreaux, Assumption Parish’s director of Homeland Security and Emergency Preparedness, has said the seismic activity was detected about 7 a.m. Friday under the sinkhole and the failed cavern.
Work was stopped within the 71-acre area surrounded by a berm that encircles the sinkhole, he said.
The work stoppage was the second of its kind in a little more than a week because of seismic activity.
Tremors early March 13 caused work to be halted for about a day inside the same berm area.
Parish officials have said Friday’s seismic activity was limited to the sinkhole and the failed cavern and had no affect on another nearby Texas Brine cavern that has raised concerns among officials and residents.
Seismic work involving three-dimensional imaging is planned for Sunday, the blog post says.
The sinkhole formed between Aug. 2 and Aug. 3 in swamps between Bayou Corne and Grand Bayou. About 350 residents in the area have been under evacuation for more than seven months.
Scientists believe a failed Texas Brine Co. LLC cavern, mined into the Napoleonville Dome, caused the massive sinkhole.