After a short historical introduction to the problem of the subsidence in the Po Valley, some
results are shown of levelling campaigns carried out by various authorities or agencies in
recent years, mainly in the southeast part of the Po Valley. We also present the results
obtained along the coastline using the GPS technique both in a static and in fast-static
modes. Attention is focused on the problem of the homogeneity of data from different
sources, different periods and using different reference benchmarks. To overcome these …