Figure 2: Uplift and VT events during unrest at Campi Flegrei. | Nature Communications

Figure 2: Uplift and VT events during unrest at Campi Flegrei.

From: Progressive approach to eruption at Campi Flegrei caldera in southern Italy

Figure 2

(a) After a secular subsidence at 0.017 m per year has been removed, vertical ground movement at the Serapeo in Pozzuoli for 1950–2016 can be divided into three stages, each consisting of (i) early uplift and (ii) intervals of minor subsidence and recovery. Recorded VT seismicity emerged in 1971–1972 (blue columns), before decaying until 1982 (black columns) and returning to high rates in 1982–1984 (magenta columns). The numbered circles identify reference stress conditions in the crust used in Fig. 5. (b) The combined uplifts show a pattern of increasing VT event rates with time. (c) Post-uplift oscillations Δh of 0.1–0.2 m occurred after 1952 and 1972 (1ii and 2ii), but reached 0.62 m after 1984 (3ii). The decay in VT event rate in 2ii was followed by a virtually aseismic uplift of 0.4 m during the first 8 months of renewed uplift in 1982.

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