Geophysical Surveys

Electro-Magnetic Conductivity measures the differences in ability of the earth and underground features to conduct electricity. Changes in electrical conductivity enable the identification of material changes in the substructure, such as interfaces between sand, rock and water.

Magnetometry measures the differences in magnetic field taken on by underground features. For example metallic substances such as UXO’s will have a greater ability to take on induced magnetism from the Earth’s magnetic field, which in turn makes them stand out from the surrounding soils and visible to a magnetometer.

Microgravity is used measure changes in gravitational field across a site. This technique is ideal for detecting underground voids and cavities, which can be identified by the survey equipment becuase the void results in a small reduction in gravity as a direct result of the reduced localised mass created by the cavity.