Core Service: Ground Penetrating Radar


  • Stratigraphic mapping including depth to bedrock
  • Locating karst features, sinkholes, voids or cave systems
  • Depth to the water table
  • Archaeology (location of graves and artefacts)
  • Location of underground infrastructure, including UST’s and utilities
  • Assessment of internal condition and defects of engineered structures
  • Assessment of road and rail infrastructure, including asphalt and ballast condition
  • Slab thickness, reinforcement placement and void detection (see more information about GPR for NDT uses here).


Ground Penetrating Radar (GPR) is a non-destructive and non-invasive geophysical technique for rapidly imaging the shallow subsurface and producing high-resolution colour sections in real-time. The method works by transmitting electromagnetic energy into the material being tested (usually the ground). Typically 100,000 impulses per second art transmitted which are of very short duration and contain a broad spectrum of frequencies.

The transmitted electromagnetic energy propagates through the subsurface as a function of the subsurface material’s electrical properties which are in turn dependent on its physical and chemical properties. Reflection of radar energy occurs at boundaries between differing stratigraphic layers of inclusions which have contrasting electrical properties. conversely, no reflections occur from a homogeneous material where there are no internal reflections. The reflections are detected by the receiving antenna placed adjacent to the transmitter. The depth to the target is proportional to the time (in nanoseconds) taken for the signal to travel from the transmitting antenna at the surface to the target and back to the receiver.

Contact us to find out what GPR options might work for you or to send in your enquire about hiring this equipment.

Featured Work

GBG investigates a wide range of structures from historically significant buildings to small private residences.

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