Nomads and Networks in the Field: Magneto and Magnetina
Claudia Chang, professor of archaeology at Sweet Briar College in Virginia, is director of an international field research project on the archaeology of the Iron Age in the Republic of Kazakhstan. Throughout the exhibition Nomads and Networks: The Ancient Art and Culture of Kazakhstan, on view in the Sackler until November 12, 2012, Claudia will share tales from her ongoing fieldwork with us on Bento.
The Munich Magneto Mob, as geophysicist Joerg Fassbinder and PhD student Lena Kuhne have dubbed themselves, have almost completed a magnetometer survey of the areas surrounding Tuzusai. “Magneto”and “Magnetina” spent a week conducting magnetometer measurements over two fields near Tuzusai in search of underground architectural features.
The device they use is called a Total View Magnetometer, which measures the magnetism below the surface. Digitized as negative or positive values, the composite readings create a magnetogram. An experienced geophysicist like Joerg has read so many magnetograms he is able to easily identify old stream channels, ditches, palisade fences, and even ovens or fireplaces.
We have learned a lot from Joerg. He has let us set the lines in each of the grid units, shown us how the magnetometer works, and even given us lectures on the physics associated with the earth’s magnetic field. He has told us about working on the Nazca Lines in Peru. It is so close to the Equator there that the magnetic anomalies are almost negligible, yet in Kazakhstan there are high levels of magnetism, even more so than in his native Bavaria, which is further north in latitude. He says that this changing magnetic field is a problem that the German mathematician and physicist Carl Friedrich Gauss thought would be solved in the 19th century, yet two hundred years later we still don’t know the answer.
In the photo above you see Magneto with his home-designed magnetometer, one of the most accurate ones in existence. The wooden parts are held together by parcel tape and can be broken down into smaller parts to fit into a suitcase. The magnetometer itself weighs about 18 kilograms (40 lbs). Imagine walking with the magnetometer taking readings every meter for a 40 X 40 m (131 x 131 feet) unit. We have calculated that Joerg and Lena walk 1.6 km (1 mile) for each grid they measure.
Their surveys, combined with the research done by the geomorphologists, might begin to tell us whether the Iron Age folk at Tuzusai and the neighboring areas redirected stream channels for irrigating their crops, and how they might have terraced certain areas of the settlement. It will be very helpful when all our specialists come up with results from their disciplines that can be used to make the “big picture” of life in this region.