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The Romans built the ancient town of Grumentum during the 3rd century B.C. in the southern part of the Agri&#13; high Valley (Basilicata Region, Southern Italy) near the confluence of the Sciaura stream in the Agri River.&#13; Now it is one of the most important archaeological sites of Southern Italy. In fact, after a period of wars in&#13; this area between Romans and Carthaginians, a great deal of restoration was started in 57 B.C. These works&#13; affected the city walls, public buildings and finally endowed the Roman colony with important infrastructures,&#13; such as the new aqueduct. In this work, we attempt to reconstruct the ancient layout of the Roman aqueduct&#13; of Grumentum. As a starting point, we followed some descriptions from the 19th century, when the structure&#13; was still well preserved. Then, we performed a multidisciplinary geophysical approach to the best preserved&#13; remains of the aqueduct. In particular, the geophysical investigation started with the use of a portable GPS allowing&#13; us to acquire the co-ordinates of the outcropping rests of the ancient structure. Then, we used an optical&#13; pumping magnetometer to perform seven gradiometric maps over a broad area of about 8000 m2. From&#13; the literature descriptions, dating to the first part of the 19th century, we can deduce that the state of preservation&#13; of the Roman aqueduct was much better than the present one. Thus we can hypothesise as the cause of&#13; its fast involution the fact that it was located in the epicentral area of the large destructive earthquake which&#13; occurred in the Basilicata Region in 1857 (Mallet, 1862). To this aim, we performed a first attempt to correlate&#13; the state of preservation of the aqueduct remains with the local seismic amplification by means of the&#13; HVSR (Horizontal to Vertical Spectral Ratio) technique. This survey allowed us to obtain the site amplification&#13; spectra along the aqueduct layout and assess the fundamental vibration frequency of the investigated&#13; structure. The possibility of landslides was ruled out by a careful geological survey. The relationship between&#13; aqueduct path and damage should then be attributed to closeness to earthquake seismogenic fault

Multidisciplinary investigations on the Roman aqueduct of Grumentum (Basilicata, Southern Italy)