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Applications

How Geophysics Is Used

Geophysics provides non-intrusive, physics-based methods to map and characterize the subsurface. Whether the goal is to locate buried structures, assess ground conditions, protect heritage sites, or support major infrastructure projects, geophysical techniques allow investigators to “see before they dig” — reducing risk, cost, and uncertainty.

Below is an overview of the major application areas where geophysics delivers practical value.

1. Archaeology & Heritage

Understanding what lies beneath without excavation

Geophysical methods allow archaeologists to detect, map, and document subsurface features rapidly and with minimal disturbance. This is essential for protecting heritage sites and planning excavation work efficiently.

Common objectives

  • Locating buried walls, foundations, and settlement structures

  • Detecting graves, cemetery boundaries, and earlier occupation layers

  • Mapping ancient roads, ditches, pits, and fortifications

  • Surveying sensitive heritage areas before construction or restoration

  • Rapid scanning of large open fields before archaeological fieldwork

  • Non-intrusive investigation around historic buildings

Typical methods used:
GPR, magnetometry, EM-induction, resistivity (ERT)

2. Engineering, Infrastructure & Construction

Assessing ground conditions before and during construction

Engineering geophysics provides vital information for design, risk evaluation, and quality control in both small and large projects. It is frequently used in urban environments where digging is costly or disruptive.

Common objectives

  • Depth to bedrock and evaluation of subsoil layers

  • Identifying voids, cavities, sinkholes, and unstable ground

  • Foundation investigations: rippability, bearing layers, old foundations

  • Utility locating: pipes, cables, tanks, and unknown services

  • Road and pavement assessment: layer thickness, delamination, integrity

  • Bridge deck condition assessment

  • Tunnel investigation and ground characterization

  • Dam safety evaluations

  • Pre-blast and vibration monitoring

  • Geotechnical baseline studies

Typical methods used:
Seismic (refraction, MASW), GPR, EM-induction, gravimetry, resistivity

3. Environmental & Groundwater

Understanding soil conditions, water resources, and contamination

Environmental applications use geophysics to map subsurface variations that relate to moisture, contamination, or geological boundaries.

Common objectives

  • Groundwater search and aquifer delineation

  • Depth to water table

  • Soil characterization for environmental risk assessment

  • Mapping contamination plumes

  • Landfill investigations and boundary mapping

  • Evaluating clay layers, sand lenses, and permeability contrasts

Typical methods used:
ERT, EM-induction, GPR, seismic methods

4. Natural Resources

Efficient exploration with reduced drilling

Non-intrusive methods support exploration programs by narrowing targets and improving geological understanding before drilling takes place.

Common objectives

  • Mineral exploration targeting

  • Geological structure mapping (faults, fractures, intrusions)

  • Sediment thickness mapping

  • Identifying bedrock features relevant for quarrying

  • Supporting geothermal exploration (temperature-linked resistivity, fracture detection)

Typical methods used:
Magnetics, gravity, seismic, EM, resistivity

5. Marine & Underwater

Subsurface imaging in coastal and offshore environments

Marine geophysics provides insight into shallow-water geology, buried objects, and sediment layers that affect engineering and environmental work.

Common objectives

  • Underwater utility detection (pipelines, cables)

  • Sediment thickness mapping and seabed characterization

  • Locating wrecks and metallic objects

  • Geotechnical assessments for ports, harbours, and offshore structures

  • Marine seismic profiling for sediment and bedrock mapping

Typical methods used:
Marine GPR (in select conditions), sub-bottom profilers, marine EM, marine seismic

How to Choose the Right Method

Different applications require different physical contrasts — electrical, magnetic, elastic, or density differences.
The Methods and Instruments sections of the site explain each technique and help match them to the correct problem.