Geophysical method
EMP
Electromagnetics
When you need to go deeper than towed resistivity, induction takes over — and without touching the ground.
How it works.
A transmitter coil creates a primary magnetic field. That field induces currents in the ground, which in turn generate a secondary field measured by a receiver coil. The difference between the two expresses the conductivity of the terrain.
The same pass yields two quantities: electrical conductivity, the inverse of resistivity, and magnetic susceptibility. No ground contact is required, which makes the method usable on terrain where electrodes cannot run.
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Depth
Down to 6 m
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Quantities
Conductivity + susceptibility
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Ground contact
None
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Deliverable
Conductivity maps
What it reveals.
- Lithological variation and geological interfaces
- Palaeochannels and groundwater pathways
- Made ground, disturbed zones and brownfields
- Salinity and conductive soils
- Depth to bedrock in deeper settings
Where we use it.
The primary tool whenever depth matters more than centimetric resolution.
A deep setting to characterise?
Let's talk geology, target depth and objectives.