GeoSure Extra: Shrink-Swell Subsurface v1 is a national hazard susceptibility map identifying areas of potential shrink-swell hazard at subcrop level in Great Britain. The data layer was produced by geologists and specialists at the British Geological Survey and is presented in GIS format. It focuses on ground movement risks in the upper two metres related to moisture variation from weather, vegetation, and human activity.
Use Cases
- Assessing foundation risk for new construction based on subsurface shrink-swell hazard susceptibility.
- Planning infrastructure routes to avoid areas with high potential for ground movement.
- Modeling climate-related ground stability changes based on moisture variation susceptibility.
- Informing insurance and property risk assessments for areas with swelling clay hazards.
Strengths
- Produced by the authoritative British Geological Survey (BGS) by geologists and geotechnical specialists.
- Provides national coverage for Great Britain at a subcrop level of detail (up to 10 metres depth).
- Focuses on a specific, well-defined hazard mechanism (shrink-swell of clays in the upper two metres).
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count and file size are unknown, which may limit suitability assessment.
- Data may reflect geographic bias inherent to its source, being specific to Great Britain.
Provenance
- Source
- British Geological Survey (BGS)
- Collection Method
- Produced by geologists, geotechnical specialists, and information developers, presented as a GIS data layer.
- Time Range
- null
- Freshness
- Last updated 2026-04 09 08:37:46.625971; freshness should be verified.
- Geography
- Great Britain