Electrical Resistivity Tomography (ERT)
Electrical Resistivity Tomography is an earth resistance technique conducted along a series of single lines or profiles, rather than area surveys. A small electrical current is applied to a series of probes laid out across a site, producing a cross-section of data indicating a broad stratigraphy of archaeology and deeper features. The electric resistivity tomography can then be combined with topographical data to provide an accurate representation of the underlying soils.
Electrical Resistivity Tomography accurately records depth information and assesses deeply buried archaeological remains such as souterrains or elements of multiphase sites including surfaces, water courses and buried walls. This technique also allows geophysical investigation in landscapes which are not generally amenable for other types of survey such as woodland, marshland and areas of dense vegetation.
Electrical Resistivity Tomography allows for the assessment of features such as
- Souterrains
- Ditches
- Walls
- Structures
- Water features
- Mounds
- Cavities / Voids / Caves