12.1-mile crude oil pipeline segment, Texas City to Galveston Bay industrial corridor. Subsidence zones marked at key facilities.
TX Gulf Coast segment is impacted by active subsidence with high displacement rate. Planned mitigation should be advanced in the next maintenance window.
| Operator | Enterprise Products |
|---|---|
| Commodity | Crude Oil |
| Diameter | 30 in |
| Length | 12.1 mi |
| HCA Proximity | 1.4 mi |
| Geohazard Classification | subsidence |
| Screening Result | Escalate to targeted Tier 2 monitoring |
| Period (days) | Samples | Mean Displacement (mm) | Max Velocity (mm/yr) | Min Velocity (mm/yr) | Mean Coherence |
|---|---|---|---|---|---|
| 36 | 6 | -37.4 | -379.0 | -42.0 | 0.875 |
Velocity Trends: Observed range -42.00 to -379.00 mm/yr across monitoring windows.
Acceleration Flags: No elevated acceleration flag. Acceleration contribution is 0.15.
high confidence — 6 observations, mean coherence 0.875, uncertainty ±1.1 mm.
| Risk Factor | Weight | Contribution |
|---|---|---|
| Acceleration | 0.15 | 15% |
| Displacement Rate | 0.25 | 25% |
| Criticality | 0.22 | 22% |
| Condition | 0.10 | 10% |
| Geology | 0.18 | 18% |
| Context | 0.10 | 10% |
Mitigation Recommendations: Schedule right-of-way survey confirmation, run geodetic tie checks, and prioritize block-valve segment review for areas with peak subsidence rates.
| Section | Severity | Description | Location | Date |
|---|---|---|---|---|
| Alert History | Warning | Subsidence rate exceeds 25 mm/yr | Segment TX-GC-SEG-0089 | 2026-02-18 |
| Source | Frames | Date Range | Processing |
|---|---|---|---|
| Sentinel-1 C-band InSAR | F38239 | 2026-01-28 to 2026-03-05 | OPERA DISP-S1 v1.1 (NASA/JPL via ASF) |