Magnetic susceptibility

Rinita Dalan has sent us the following note.

The magnetic susceptibility data collected over an 80x80m area in the western survey area is shown on top of the mag survey. These measurements were collected on a 2 m grid. Even though the Bartington MS2D sensor that we used measures only the top portion of the soil, some interesting correlations are apparent, including the ditch as well as relatively low and high susceptibility zones within areas defined by linear anomalies in the mag data. The second figure is a smoothed version of this data, highlighting broad patterns in susceptibility.

The magnetic susceptibility data overlain on the magnetic gradient map.

The magnetic susceptibility data overlain on the magnetic gradient map.

A slightly smoothed version of the data from the previous image.

A slightly smoothed version of the data from the previous image.

And finally, take a look at the relatively shallow, but yet interesting, down-hole susceptibility records that we managed to collect despite very gravelly and flinty soils. Lots of contrast and nice correlation between areas indicates that down-hole work would be useful if we could only sort out how to make the hole for the sensor. Larry provided the locations of rubble-free areas that allowed us to do the tests over by the tennis courts on the last day of the course (T3_4 and T5_6).

Downhole magnetic susceptibility data.

Downhole magnetic susceptibility data.

A big thanks to all the participants for their enthusiastic support and help with the susceptibility work and most especially to Roger for fixing the auger so that we could collect more down-hole data.

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