ERT Survey at the Wall of Acropolis of Athens

A non destructive ERT survey at the south wall of Acropolis at Athens is described. The survey aimed to investigate the area behind the wall mainly to image the ways that the water is drained downwards from the Acropolis hill. This is major threat for the integrity of the monument evidenced already by the distortion of the wall. Several technical issues were encountered performing a survey on a wall. Further, modifications to the inversion algorithm had to be implemented. The results comprise images of the water ways.