To the Phlegraean Fields the increase in is confirmed bradyseismwhile the seismicity: according to the latest bulletin of the INGV Vesuvian Observatory, in the week from 10 to 16 November 2025, 88 earthquakesof maximum magnitude 2.1 (a clear decrease compared to the 165 tremors of the previous week) while from 10 October 2025 the average speed of ground lifting, linked to bradyseism, is confirmed to be increasing at 25 ± 3 mm/month.
Looking at the geochemical parameters, however, the already known warming trends of the hydrothermal system are confirmed, with an average value of ~94°C to the Pisciarelli fumarole. At the main fumarole of the Solfatara crater, the temperature increases slightly, with an average value of 173 °C. Meanwhile, in the early hours of today, November 18, the seismographs recorded 6 slight earthquake tremorsof maximum magnitude 1.8 and depths between 2 and 3 km.
At the moment, INGV has not detected elements that suggest significant developments in the short term.
Seismic activity decreases in the Campi Flegrei: 88 tremors recorded
From 10 to 16 November 2025 the INGV located at the Campi Flegrei 88 earthquakeswith a magnitude between 0.0 and 2.1. Of these shocks, 24 were recorded over the course of 2 seismic swarms:
- The first swarm started at 08:31 on 12/11/2025 in the Solfatara area, with 13 earthquakes of maximum magnitude 1.4.
- The second swarm started at 05:43 on 11/15/2025 in the Solfatara-Pisciarelli area, with 11 earthquakes of maximum magnitude 2.1.
As is usual in the Campi Flegrei, the tremors had one reduced depthtypical of bradyseismic seismicity which is caused by the rising of the ground and not by the activation of faults. In particular, hypocenters were detected at depths between 0.85 km and 4.95 km.
From a geochemical point of view, the parameters confirm the already known heating and pressurization trends of the hydrothermal system. In the area of Pisciarellithe temperature of the fumarole remains at an average value of 94°C. In the area of the Solfatara crater, however, the main fumarole (BG) confirms its increasing trend, with average values of ~173°C.
Bradyseism and soil uplift: the data
As regards bradyseism, starting from 10 October 2025 the INGV has recorded a increase in ground lifting speedwith an average monthly lifting value that first reached 20±5 mm/month in the previous ones, and then settled at the current 25±3 mm/month.
This acceleration therefore marks an increase compared to the 15 ± 3 mm/month observed from early April to mid-October. From January 2025the total lift recorded at the RITE GNSS station (Rione Terra) is approximately 19cm.
The latest bulletin on the Campi Flegrei in summary
In summary, the data from the latest weekly bulletin on the monitoring of the Campi Flegrei indicate:
- Seismicity: 88 earthquakes (Mdmax 2.1), a clear decrease compared to 165 (Mdmax 2.5) the previous week.
- Swarms: two seismic swarms recorded on 12/11 and 15/11, for a total of 24 shocks.
- Soil lifting: the average speed is confirmed at 25 ± 3 mm/month, up compared to 15 ± 3 mm/month in the period April-October 2025.
- Geochemistry: Stable parameters, with the Pisciarelli fumarole at 94 °C and the Solfatara at 173 °C.
