Figure 1

(a) Campi Flegrei caldera GPS monitoring network (small squares, 21 permanent stations + 4 buoys offshore)27. Background map modified from the INGV periodic bulletin of Campi Flegrei8. The 11 analyzed stations are marked with colors: RITE station is red, 4 proximal stations are blue, 6 distal stations are green. Other GPS stations and buoys are gray. The seismic catalog reference station STH is a red circle. (b) Overview of the ground displacement at Campi Flegrei in 1983–2020. The data merge leveling data, collected at benchmark 25A, and the RITE GPS. (c) Overview of the earthquakes recorded at Campi Flegrei in 1983–2020. In (b,c) the data collected in 2000–2020 are marked in blue. Data modified from the INGV periodic bulletin of Campi Flegrei (http://www.ov.ingv.it).