A first GPS measurement of vertical seafloor displacement in the Campi Flegrei caldera (Italy)

The methodology shown in this paper is reliable over time and economical, compared to other systems of measurement of marine geodesy. The major limitation is the depth of the sea, confining this technique to the shallow water, up to 100 m depth. However, a large part of the submerged Campi Flegrei caldera is shallower than 100 m, so geodetic monitoring by means of GPS buoys at several sites in the Gulf of Pozzuoli would allow to extend interpretative models to the entire caldera, submerged and emerged.