Geophysical prospection pilot in rock-cut tombs: the case study of Anghelu Ruju necropolis (Sardinia)

Electrical Resistivity Tomography (ERT) and Ground Penetrating Radar (GPR) surveys were conducted in the Anghelu Ruju hypogeic necropolis in northern Sardinia (Italy). The main purpose was to calibrate both techniques on a known and already dug tomb. After the calibration the survey was extended to neighboring unexplored area aiming to evidencing new hypogeic structures. A comparison of the high-resolution GPR and ERT models was made, and their integrated results are discussed in terms of providing a more complete picture that would not be attainable using a single method. Several anomalies were identified that might represent previously unknown rock-cut tombs and burial sites in the central part of the investigated area.