A magnitude 2.9 earthquake was recorded at 3:30 AM local time in the province of Naples, Italy, within the Campi Flegrei volcanic area. The tremor, according to the National Institute of Geophysics and Volcanology (INGV), had a shallow hypocenter of just three kilometers depth and an epicenter two kilometers from Pozzuoli. No damage to people or property has been reported following the earthquake in the Campi Flegrei, a region under increased scrutiny due to ongoing seismic activity.
This latest event follows two earthquakes of magnitudes 3.6 and 3.7 that struck the same area three days prior, continuing a pattern of increased seismic unrest. The Campi Flegrei, a large volcanic caldera west of Naples, has experienced a surge in earthquake frequency in recent months, prompting authorities to raise the alert level. The area is known for its bradyseism – the slow rising and falling of the ground – and has a complex history of volcanic eruptions.
Recent Seismic Swarm and Ground Deformation
The INGV reported that during January 2026, a total of 285 earthquakes were registered in the Campi Flegrei area, with a maximum magnitude of 3.1. The vast majority of these events – 291, or 91.58% – were of magnitude less than 1.0 and often tricky to distinguish from background noise. Seven events registered between magnitudes 2.0 and 2.9. The Osservatorio Vesuviano, part of the INGV, continues to monitor the situation closely.
Beyond the increased frequency of earthquakes, the Campi Flegrei are similarly experiencing significant ground deformation. Since April 2025, the area has been uplifted at an average rate of approximately 15 millimeters per month. This rate increased to around 25 millimeters per month starting in October 2025, before decreasing again to 15 millimeters per month from mid-December 2025. At the RITE GNSS station, the total uplift recorded since November 2005 is approximately 161.5 centimeters, with 23.5 centimeters of that occurring since January 2025.
Historical Context and Volcanic Risks
The Campi Flegrei caldera was formed by two massive eruptions: the Campanian Ignimbrite eruption approximately 40,000 years ago and the Neapolitan Yellow Tuff eruption around 15,000 years ago. These events created the complex caldera landscape seen today. The area’s volcanic history is characterized by phreatomagmatic, strombolian, and plinian eruptions. The last eruption occurred in 1538, with the formation of Monte Nuovo, a volcanic cone visible in the landscape.
The recent seismic activity has prompted a heightened state of alert, though authorities emphasize that the current situation does not indicate an imminent eruption. The alert level remains at yellow, signifying a medium imbalance with monitoring parameters above baseline values. Hydrothermal emissions, ground deformations, and ongoing seismicity are all being closely monitored.
Monitoring and Future Outlook
Scientists are continuously analyzing data from various monitoring systems, including seismographs, GPS stations, and gas emission sensors, to understand the dynamics of the Campi Flegrei. Temperature readings in the Solfatara and Pisciarelli areas remain stable, but geochemical parameters indicate a long-term trend of heating and pressurization within the hydrothermal system. This suggests that magma may be accumulating beneath the surface, although the exact processes are still under investigation.
Residents and visitors in the Campi Flegrei area are advised to stay informed about the latest developments and follow the guidance of local authorities. The INGV publishes weekly bulletins providing updates on the volcanic activity. The next scheduled update is expected in the coming days, providing further insight into the ongoing seismic activity and ground deformation. For the latest information and official guidance, please refer to the INGV and the Osservatorio Vesuviano websites.
The situation at Campi Flegrei remains dynamic, and continued monitoring is crucial to assess the potential for future volcanic activity. The scientific community is dedicated to understanding the complex processes at play and providing timely information to protect the population and infrastructure in this densely populated region of Italy.
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