M4.4 earthquake triggers seismic swarm at Italy’s Campi Flegrei caldera
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May 21, 2026
A shallow M4.4 earthquake struck the Campi Flegrei caldera west of Naples, Italy, at 05:50 LT (03:50 UTC) on May 21, 2026, beginning a seismic swarm that ended after 12 earthquakes.
Source
Discussion in the ATmosphere