The knowledge of the dynamic of the Campi Flegrei calderic system is a primary goal to mitigate the volcanic risk in one of the most densely populated volcanic areas in the world. From 50s to 80s Campi Flegrei suffered three bradyseismic crises with a total uplift of almost 4.3 m. After a period of subsidence of 20 years, the uplift started again in 2005 accompanied by a low increment in the seismicity rate. In 2012 an increment in the seismic energy release and a variation in the gas composition of the fumaroles of Solfatara (in the central area of the 1 caldera) were recorded. Since then, a slow and progressive increase in phenomena continued until today. We analyze the seismic catalogue of Campi Flegrei from 2000 to 2020 collected by INGV-Osservato-rio Vesuviano to look for any variation in the seismic parameters and compare them with geochemical monitored ones. A remarkable correlation between independent variables as earthquake cumulative number, CO/CO 2 values and vertical ground deformation reveals a likely common origin. The interpretation of the seismological, geochemical and geodetical observable brings back to the injection of magmatic fluids into the hydrothermal system or its pressurization.