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Much of the image consists of blank locations now with little or no radar reaction. The "courtyard" wall is still revealing strongly, however, and there are continuing recommendations of a hard surface area in the SE corner. Time slice from 23 to 25ns. This last slice is now practically all blank, however a few of the walls are still revealing strongly.

How deep are these slices? Regrettably, the software I have access to makes approximating the depth a little difficult. If, however, the top three pieces represent the ploughsoil, which is probably about 30cm think, I would guess that each slice has to do with 10cm and we are only getting down about 80cm in total.

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Fortunately for us, the majority of the sites we are interested in lie simply listed below the plough zone, so it'll do! How does this compare to the other approaches? Comparison of the Earth Resistance information (top left), the magnetometry (bottom left), the 1517ns time piece (leading right) and the 1921ns time slice (bottom left).

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Magnetometry, as gone over above, is a passive strategy measuring local variations in magnetism against a localised no value. Magnetic susceptibility study is an active technique: it is a procedure of how magnetic a sample of sediment could be in the presence of a magnetic field. How much soil is tested depends upon the size of the test coil: it can be very small or it can be reasonably big.

The sensor in this case is really small and samples a tiny sample of soil. The Bartington magnetic susceptibility meter with a big "field coil" in usage at Verulamium during the course in 2013. Top soil will be magnetically enhanced compared to subsoils simply due to natural oxidation and reduction.

By determining magnetic susceptibility at a reasonably coarse scale, we can find areas of human profession and middens. We do not have access to a dependable mag sus meter, however Jarrod Burks (who helped teach at the course in 2013) has some excellent examples. Among which is the Wildcat website in Ohio.

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These villages are typically set out around a main open area or plaza, such as this rebuilt example at Sunwatch, Dayton, Ohio. Sunwatch Town, Dayton, Ohio (image: Jarrod Burks). At the Wildcat website, the magnetometer survey had actually found a variety of functions and homes. The magnetic vulnerability survey helped, however, specify the main location of occupation and midden which surrounded the more open area.

Jarrod Burks' magnetic susceptibility study results from the Wildcat website, Ohio. Red is high, blue is low. The method is therefore of terrific use in specifying locations of basic occupation rather than identifying specific functions.

Geophysical surveying is an applied branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electro-magnetic physical approaches at the Earth's surface area to measure the physical properties of the subsurface - Geophysical Surveys For Planning & More in Ferndale Western Australia 2021. Geophysical surveying approaches typically measure these geophysical homes in addition to anomalies in order to evaluate different subsurface conditions such as the presence of groundwater, bedrock, minerals, oil and gas, geothermal resources, voids and cavities, and much more.