Sulphur Mines Investigation

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This page was updated on 04/24/2025 at 5:44:04 PM.

Subsidence Reports

Operators of salt caverns in Louisiana submit yearly subsidence reports to LDENR as a compliance requirement by the state. As part of an enhanced program to monitor ground subsidence at Sulphur Mines, Westlake was ordered by LDENR to provide more frequent updates and reports since January 2023.

The method used is InSAR, which employs satellites to approximate relative ground movement over time. Currently, one satellite (SNT) provides data every 12 days, and one satellite constellation (TSX/PAZ) provides data every 4 and 7 days, respectively. 

2022 Annual InSAR Survey of Ground Displacement and Subsidence Monitoring Report - received April 21, 2023

2023 Annual InSAR Survey of Ground Displacement and Subsidence Monitoring Report - received April 30, 2024

TRE-Altimara Response Regarded Reprocessing of Data and New Baseline - received January 29, 2024

InSAR corner reflector station

Status Update (memo) - received July 1, 2024

June 2024 - received July 18, 2024

July 2024 - received August 13, 2024 

August 2024 - received September 13, 2024 

September 2024 - received October 16, 2024

October 2024 - recieved October 15, 2024

November 2024 - received December 13, 2024

December 2024 - received January 15, 2025

January 2025 - received February 14, 2025

February 2025 - received March 14, 2025

March 2025 - received April 15, 2025

Previous years:

2023 Reports 

2024 Reports

2025