The non-destructive assessment of archaeological sites without interfering with the features is an ever-increasing part of archaeological research. This allows for relatively quick information about the underground archaeological features to be gained without excavation.
Using geophysical methods in archaeology may significantly increase the efficiency of archaeological operations and facilitate its cost-planning. It is recommended every time when information is necessary about the underground features before the actual operation.
Salisbury Archaeology is dramatically reducing risks and costs associated with the presence of archaeological remains by producing site, landscape and geophysical surveys in addition to topographic surveys.
For assessing the sites, we use all of the three methods generally used for archaeological purposes.
The magnetometer survey is one of the best research methods to assess archaeological features in an undeveloped area of greenfield investments. The instrument measures the minor variations of Earth’s magnetic field based on a dense network; underground features have minor magnetic properties that are different from their environment. Its main advantage is that relatively large areas (even 5-10 hectares a day) can be mapped cheaply using our instrument attached to a vehicle.
Within georadar survey, the subsurface structures are assessed by the reflection of electromagnetic waves. The advantage of the method is that it provides high-resolution and accurate results in case of walls and phenomena with different materials.
This method is primarily suitable for detecting subsurface features with various specific resistance. In case of archaeology, it is primarily used for measuring stone walls or floors, as these have a significantly different specific resistance. Its advantages are that the survey can be done in forested or disturbed surfaces, and it can be effectively used for detecting underground walls and holes. It also generates depth related data and provides interpretable data even up to 10 meters of depth.