Figure 6

Overview of earthquakes recorded at Campi Flegrei in 1983–1985, including swarms. Plot (a) shows the monthly count, plot (b) the weekly count, plot (c) the daily count. The three greatest swarms, comprising more than 250 events, are labeled in (c). Plots (d–f) show the annual rate of (d) all seismic events recorded, (e) seismic strain release rate, and (f) seismic energy estimation. All rates are calculated on a 30-day moving average. In (d–f) the days with > 20 events are marked with black crosses along the x-axis. In (d) the main peaks are marked and the inter-peak times are labeled.