Fig. 2: Variations in uplift and VT seismicity between 1950 and 2022.
From: Potential for rupture before eruption at Campi Flegrei caldera, Southern Italy
a Time series for measured and corrected uplift at Pozzuoli (solid and dashed black curves) and monthly rates of seismicity (columns). After the VT event rate reached a peak in 1984, Campi Flegrei remained almost aseismic during three decades of slow subsidence and uplift. Persistent VT seismicity recommenced in 2015–2016, when the corrected uplift returned to its position in 1984 (magenta arrows). We initially interpreted the decay in VT rate after 1972 as evidence of partial relaxation of the crust4; however, some or all of the events may have been caused by the illegal fishing practice of detonating explosives to drive sea-floor creatures to the surface. b Between 2015 and 2020, VT event rates accelerated to a steady mean value of about 175 events per month. The acceleration began when the corrected uplift had been restored to its 1984 position (magenta arrow). Data from INGV-Sezione di Napoli (Osservatorio Vesuviano)71,72.
