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Geomagnetics

If a search is made for iron-containing bodies in the subsurface, geomagnetics is the medium of choice. This method detects particularly good ferromagnetic materials, e.g. Iron.

Principle of Measurements

Geomagnetics is a so-called passive geophysical method. The change in the strength of the magnetic field is measured locally. Thus, a ferromagnetic disturbance body in the ground causes the magnetic field to change around the body. This change can be detected with a magnetometer on the surface or in a borehole. During the evaluation of the measured data, disturbing bodies can then be identified as anomalies.

The extent to which the magnetic field changes depends primarily on the size of the body and on the distance to the location of the measurement. A large iron body can usually be detected clearly at a distance of 3 m from the measuring point; under very good conditions even at a distance of 5 m.


TAUBER carries out geomagnetic surveying with  Z-gradiometers and 3-axis-magnetometers from various manufacturers. The probing can take place in different forms, adapted to the respective situation

  • Borehole survey
  • Surface survey
  • Land multi-channel survey
  • Marine multi-channel (up to 10 m water depth)
  • Multi-channel sounding of hard-to-reach terrain (e.g., moor, watts, oil fields) using hovercraft, amphibian vehicles or drones