Campi Flegrei quake felt strongly in Naples.
Italy’s Campi Flegrei, a highly seismic zone near Naples, was shaken on Monday by a 4.6-magnitude earthquake, the strongest to hit the area in 40 years.
The earthquake occurred at 12.47 at a depth of five kilometres in Bacoli, Italy’s National Institute of Geophysics and Volcanology (INGV) said in a statement.
The tremor sent panicked residents running into the streets, interrupting some Maturità high-school exams, however there were no immediate reports of injuries of structural damage.
[DATI #RIVISTI] #terremoto Md 4.6 ore 12:47 IT del 30-06-2025 a Campi Flegrei Prof= 4.9 Km #INGV_43270472 https://t.co/IqNOh4GhcT
— INGVterremoti (@INGVterremoti) June 30, 2025
In addition to the Campi Flegrei towns of Pozzuoli, Quarto and Bacoli, the earthquake was felt clearly in western areas of Naples as well as on the island of Procida.
Local train services were also suspended temporarily.
Earlier this year the Campi Flegrei area was hit by two strong earthquakes, including one of 4.4 magnitude in May and one of 3.9 magnitude in February.
Campi Flegrei
Declared a regional park 20 years ago, the Campi Flegrei area is a highly seismic zone of supervolcanic calderas, situated to the west of Naples and about 50 kilometres from Mount Vesuvius.
The Campi Flegrei volcano last erupted in 1538 however earthquakes have been common in the area since 1950, with a surge of seismic unrest in the early 1980s.
Experts believe the recent spike in seismic activity is linked to bradyseism, a phenomenon that involves the gradual uplift or descent of part of the earth’s surface, caused by the filling or emptying of underground magma chambers or hydrothermal activity.
There are 15 towns in the Campi Felgrei area with a combined population of more than half a million people living in the so-called ‘red zone’ most at risk.
Last year the Italian government announced new measures in light of the increased seismic activity in the area, updating emergency plans for a possible mass evacuation.
