Geophysical survey

Geophysical survey May 2019

A Bartington high resolution fluxgate gradiometer was used to map magnetic anomalies in the ground. The technique can identify disturbed soils and features such as ditches, walls and hearths. A Geoscan RM85 resistance meter with probes was used to map ground electrical resistance in parts of the surveyed area.

Problems with the equipment limited the area that could be mapped by resistance but all the selected grids were mapped using the fluxgate gradiometer over Wednesday afternoon, Thursday and Friday morning.

Adrian Maldonado setting up the Bartington fluxgate gradiometer

A baseline was created using 12 canes 20m apart. The areas to be surveyed were gridded using 20m squares built up from the baseline, the locations of grid corners measured by GPS and lines 2m apart laid within each grid to guide the gradiometer.

Team Glasgow – Anouk, Adrian, Scott and Megan planning the survey

Using tapes to accurately position the 20m marker canes

Aerial Image with the Survey Grids Superimposed

Preparing to lay the string lines within a grid

Unravelling string to lay lines within a grid to guide the gradiometer

Deciding on the gradiometer plan

Adrian Maldonado in action with gradiometer

Anouk Busset with the gradiometer in the unrecorded ‘cist’ area

Problems with the resistance meter

Scott driving the resistance meter

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