A new earthquake swarm began at 14:09 UTC on August 31, 2025, in the Campi Flegrei caldera, Italy. By 07:30 UTC on September 1, 94 earthquakes were recorded, including a shallow M4.0 event near Pozzuoli at 02:55 UTC.

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A state of emergency was declared for Italy’s Campi Flegrei area on May 13, 2025, following an M4.4 earthquake within a swarm of earthquakes that produced 49 registered events. The swarm began at 12:06 LT on May 13 and ended during the morning hours of May 14, according to the INGV Vesuvian Observatory. The Campi Flegrei caldera is one of Europe's most closely monitored volcanic areas due to its dense population and history of significant unrest.

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