Tomographic Imaging of Ancient Wall Foundations in Thessaloniki, North Greece

Introduction A survey involving both surface and cross borehole Electrical Resistivity Tomographies (ERTs) is described. It was conducted at various parts of the western wall of the city of Thessaloniki (N. Greece) aiming to estimate the extent of the walls’ foundations. The Thessaloniki city walls have been initially erected during the Hellinistic and early Roman period. A second phase, which is partly preserved until today, was build during the Byzantine period. It runs parallel to the olde..