Bradyseism in the Phlegraean Fields

The Phlegraean Fields are a vast active volcanic area affected by the phenomenon of "bradyseism": a ground deformation involving slow lowering (subsidence) phases alternating with more rapid uplift phases, the latter generally followed by shallow, low-magnitude earthquakes. 

A new uplift phase of the Phlegraean Fields caldera began in 2005 and is still ongoing. Since 2023, the frequency of earthquakes has gradually increased. In the same year, the strongest earthquakes occurred on September 27 and October 2, with magnitudes of 4.2 and 4.0, respectively. In 2024, the most significant event occurred on May 20 with a magnitude of 4.4, leading to the extraordinary mobilization of the National Civil Protection Service in support of the Campania Region by a decree of the Minister for Civil Protection and Sea Policies on May 30, 2024.

As a response to the ongoing bradyseismic crisis, volcano monitoring activities were strengthened, and, more broadly, prevention efforts of the Civil Protection System have been intensified. In particular, Decree-Law No. 140 of October 12, 2023, provided urgent measures to prevent seismic risk related to the bradyseismic phenomenon in the Phlegraean Fields area.

Map of Rapid Emergency Planning in the Phlegraean Fields