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Much of the image includes blank locations now with little or no radar response. The "courtyard" wall is still revealing strongly, however, and there are continuing tips of a tough surface in the SE corner. Time piece from 23 to 25ns. This last slice is now nearly all blank, but a few of the walls are still showing strongly.

How deep are these slices? Unfortunately, the software I have access to makes approximating the depth a little difficult. If, however, the leading 3 pieces represent the ploughsoil, which is most likely about 30cm think, I would think that each slice has to do with 10cm and we are only coming down about 80cm in total.

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Thankfully for us, many of the sites we have an interest in lie simply below the plough zone, so it'll do! How does this compare to the other methods? Contrast of the Earth Resistance data (leading left), the magnetometry (bottom left), the 1517ns time slice (top right) and the 1921ns time piece (bottom left).

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Magnetometry, as gone over above, is a passive technique determining regional variations in magnetism versus a localised zero value. Magnetic vulnerability survey is an active strategy: it is a step of how magnetic a sample of sediment could be in the presence of a magnetic field. Just how much soil is checked depends upon the diameter of the test coil: it can be really small or it can be reasonably large.

The sensing unit in this case is very small and samples a tiny sample of soil. The Bartington magnetic vulnerability meter with a large "field coil" in usage at Verulamium during the course in 2013. Top soil will be magnetically boosted compared to subsoils just due to natural oxidation and reduction.

By measuring magnetic vulnerability at a reasonably coarse scale, we can identify areas of human profession and middens. We do not have access to a trustworthy mag sus meter, but Jarrod Burks (who helped teach at the course in 2013) has some excellent examples. Among which is the Wildcat site in Ohio.

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These towns are often laid out around a main open location or plaza, such as this rebuilt example at Sunwatch, Dayton, Ohio. The magnetic susceptibility study assisted, nevertheless, define the primary area of occupation and midden which surrounded the more open location.

Jarrod Burks' magnetic susceptibility study results from the Wildcat website, Ohio. Red is high, blue is low. The technique is for that reason of great use in defining locations of basic profession instead of determining specific functions.

Geophysical surveying is a used branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electro-magnetic physical methods at the Earth's surface to measure the physical homes of the subsurface - What Is A Seismic Survey? in Jolimont Western Australia 2023. Geophysical surveying techniques generally determine these geophysical properties together with anomalies in order to examine different subsurface conditions such as the presence of groundwater, bedrock, minerals, oil and gas, geothermal resources, spaces and cavities, and far more.