Geomorphological and non-destructive GPR survey for the conservation of frescos in the rupestrian churches of Matera (Basilicata, southern Italy)

In this article we present the results of a geomorphological and geophysical investigation carried out in the Regional Park of Matera Murgia, also known as Park of the Rupestrian Churches (world site protected by UNESCO), in Basilicata region, southern Italy. The aim of this investigation is to support the scheduled restoration works in some rupestrian historical sites and the safety of the tourist route that connects the churches along the eastern side of Gravina river valley. In particular, a ground penetrating radar (GPR) prospection was conducted on frescoed surfaces in two rupestrian churches permitting the detection of different kinds of problems affecting the fresco surfaces, such as lesions and efflorescence.