Pipeline Geohazards: Why Ground Movement Is the Integrity Threat You Can’t Walk

A pipeline is only as stable as the ground around it. Corrosion and mechanical damage get most of the attention in integrity programs, but slopes creep, soils settle, and land subsides along hundreds of miles of right of way. These pipeline geohazards can load a line slowly for years before anyone notices, and they often sit in places that are hard to reach and rarely walked.

This article covers what pipeline geohazards are, why they are difficult to catch with traditional pipeline inspection alone, and how satellite monitoring is helping operators screen entire corridors for ground movement.

What are pipeline geohazards?

Geohazards are natural or human-influenced ground processes that can damage infrastructure. For pipelines, the most common include:

• Landslides and slope creep: soil on a slope moves downhill, pushing or pulling a buried pipe sideways
• Land subsidence: the ground sinks, often from groundwater or hydrocarbon extraction, mining, or compressible soils
• Settlement: localized sinking around crossings, fill sections, or facility tie-ins
• Heave and lateral spreading: the ground lifts or moves sideways, for example from frost or saturated soils
• Erosion and washouts: water removes cover or support at river crossings and drainages

What these share is displacement. The soil moves, and the pipe is forced to move with it or resist it. That adds stress and strain the original design may not have anticipated.

How ground movement affects pipeline integrity

A buried pipe can tolerate some movement. The risk grows when movement is uneven along the line, concentrated at one location, or accelerating. Differential movement can lead to:

• Bending stress and strain, especially at bends, tees, and anchors
• Local buckling or wrinkling under compressive strain
• Fatigue damage from repeated seasonal movement
• Loss of fitness-for-service margin at existing anomalies such as dents or corrosion
• Added loads on valves, flanges, and connections at stations and plant tie-ins

For refineries and processing plants, the same concerns apply to interconnecting lines, pipe racks, and buried piping within the facility fence line.

Why geohazards are hard to catch

Pipeline integrity management programs rely on proven tools: in line inspection, aerial and ground patrols, cathodic protection surveys, and geotechnical assessments. Each is valuable, but each has limits when it comes to ground movement.

In line inspection reports pipe condition at the time of the run, and runs are typically years apart. Patrols can spot obvious surface signs, but slow creep or subsidence rarely leaves visible clues until it is advanced. Geotechnical instruments such as inclinometers give excellent data, but only at the few sites where they are installed.

The result is a visibility gap. Across a long right of way, operators often do not know where the ground is moving until an anomaly appears in an inspection report, or until something fails.

Screening the full right of way with satellite InSAR

InSAR (Interferometric Synthetic Aperture Radar) compares repeat satellite radar images of the same ground to build a millimetric movement history for every point the satellite can see. For a fuller explanation, see our guide to InSAR for infrastructure monitoring.

Using repeat Sentinel-1 observations, this approach offers pipeline operators:

• Corridor-wide coverage: every mile screened the same way, not just known problem sites
• No field access: no sensors, no crews, and no interruption to operations
• Movement between inspections: visibility into the years between ILI runs and geotechnical surveys
• Historical trends: archived imagery shows how ground has behaved in the past

Rezatec ties these movement measurements to individual pipeline segments and classifies them: no movement, gradual and even settlement, or uneven and accelerating movement. That turns a dense cloud of satellite data into a ranked list of segments for review. Where conditions cannot support a confident reading, the platform flags the limitation instead of hiding it.

From ground movement to an engineering decision

Knowing that ground moved is useful. Knowing whether that movement threatens the pipe is what drives action.

That is the question Rezatec and Paulin Research Group (PRG) answer together. When a segment is flagged, engineers use the observed magnitude, location, and trend of movement to build a displacement and loading scenario. PRG’s FEA tools, FEPipe and Konnect, then evaluate the resulting pipe stress, strain, buckling, fatigue, and fitness-for-service implications, supporting assessments under ASME B31, API 579/ASME FFS-1, and ASME Section VIII Division 2 Part 5.

The workflow runs in four steps:

1. Satellite monitoring of the full right of way
2. Segment-level classification of movement by rate and pattern
3. Engineering assessment of flagged segments with FEA
4. Actionable reporting in GIS-ready outputs, ranked so teams know what to inspect, analyze, or repair first

Strengthening your asset integrity management program

Satellite geohazard monitoring is not a replacement for in line inspection, patrols, or fitness-for-service work. It is designed to complement them, extending visibility between inspection cycles and directing engineering time where it adds the most value. For an asset integrity management program, that can mean:

• A repeatable movement history for every segment
• Earlier flags for engineering review
• Fewer unnecessary field surveys
• Objective data for pipeline risk assessment, inspection planning, and capital budgets
• Outputs that plug into existing GIS and AIM workflows

Learn more

In Rezatec’s webinar, Todd Sajwaj, Head of Research & Data Science at Rezatec, and Bon Saunders of Paulin Research Group explain how satellite-derived ground-movement intelligence supports integrity decisions across pipelines, terminals, and tank farms.

Watch the webinar playback: Ground Movement, Geohazards & Asset Integrity

For an overview of how Rezatec monitors ground movement along buried pipelines and beneath tank farms, read Predictive Ground Movement Monitoring for Tanks & Pipelines.

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