Non Destructive ERT Survey at the South Wall of Akropolis of Athens, Greece

Resistivity tomogaphies were carried out on the south wall of the Akropolis in Athens. The electrode lines were deployed vertically and horizontally on the wall plus on the top of the hill. Further, some tomogarphies were conducted encompassing the volume of the material between the wall and open pits (baulks). Bentonite mud was employed instead of metal stakes in order to comply to the non destructive character of the whole operation. An existing algorithm was modified to cope with the particular requirements of this unconventional survey. Areas of increased moisture were revealed in the prospected volumes. Further, the thickness of the wall was assessed in particular locations. It is showed that this type of surveys are perfectly feasible and can produce results informative and elucidating images to archaeologists and restoration scientists.