geophysical techniques

magnitude surveys is skilled at collecting, processing and visualising a range of geophysical techniques. This allows us flexibility in designing a survey strategy tailored to your needs and the site environment.

We also offer training services for the collection, processing and visualisation of the following techniques:

Magnetometry

Measures the ambient magnetic field strength. Effective for detecting features with magnetic contrast from the surrounding soil.

    • typical examples include burnt features, pits and ditches.

Ground Penetrating Radar

Measures the travel time of reflected high-frequency electromagnetic radiation. Effective for detecting abrupt interface changes and voids

    • typical examples include foundation remains, graves and tombs.

Earth Resistance

Measures the difficulty of passing an electric current through the ground. Effective for detecting features with different moisture content from the surrounding soil.

    • typical examples include foundation remains and ditches.

EM Conductivity

Measures the ease of which current flow can be induced in material. Effective for conductive features, in particular

    • typical examples include geomorphological features, ditches and earthworks.

Earth Resistivity Tomography

Similar to earth resistance, but is used to create 2D slices and 3D views of the difficulty of passing an electric current through the ground.

    • typical examples include determining the depth of known features.

Magnetic Susceptibility

Measures the ease of which a material can be magnetised. Effective for detecting features with magnetic contrast from the surrounding soil

    • typical examples include burnt features, pits,and ditches, as well as understanding intra-site activity areas.