8.2-mile NGL pipeline segment along US-119, Preston County, WV. Two active landslide alert locations shown.
WV Appalachian corridor segment shows sustained displacement and landslide influence. Immediate intervention is recommended to reduce near-term integrity risk.
| Operator | Marathon Pipe Line LLC |
|---|---|
| Commodity | NGL (Natural Gas Liquids) |
| Diameter | 24 in |
| Length | 8.2 mi |
| HCA Proximity | 0.8 mi |
| Geohazard Classification | landslide |
| Screening Result | Escalate to Tier 2 and Tier 3 review |
| Period (days) | Samples | Mean Displacement (mm) | Max Velocity (mm/yr) | Min Velocity (mm/yr) | Mean Coherence |
|---|---|---|---|---|---|
| 180 | 15 | -14.2 | -42.0 | -12.0 | 0.39 |
Velocity Trends: Observed range -12.0 to -42.0 mm/yr across monitoring windows. Sustained downslope displacement consistent with active landslide.
Acceleration Flags: Elevated acceleration contribution (0.22) indicates potential non-linear displacement behavior.
low confidence — 15 observations over 180 days, mean coherence 0.39 (vegetated terrain), uncertainty ±4.2 mm.
| Risk Factor | Weight | Contribution |
|---|---|---|
| Acceleration | 0.22 | 22% |
| Displacement Rate | 0.28 | 28% |
| Criticality | 0.18 | 18% |
| Condition | 0.12 | 12% |
| Geology | 0.15 | 15% |
| Context | 0.05 | 5% |
Mitigation Recommendations: Execute immediate geotechnical inspection at MPs 3.2 and 5.7, increase InSAR refresh cadence, and validate strain instrumentation alignment with known slide planes.
| Section | Severity | Description | Location | Date |
|---|---|---|---|---|
| MP 3.0–3.5 | Critical | Displacement rate exceeds 40 mm/yr — active landslide zone. Action: ValidationRequired (low confidence). | MP 3.2 | 2026-02-11 |
| MP 5.5–6.0 | Critical | Displacement rate exceeds 35 mm/yr — secondary slide plane. Action: ValidationRequired (low confidence). | MP 5.7 | 2026-02-24 |
| Source | Frames | Date Range | Processing |
|---|---|---|---|
| Sentinel-1 C-band InSAR | F20434 | 2025-09-01 to 2026-03-05 | OPERA DISP-S1 v1.1 (NASA/JPL via ASF) |