Earthquake & Volcano Monitor — 2026-05-23
A shallow M4.4 earthquake triggered a seismic swarm at Italy's Campi Flegrei caldera on May 21, while Indonesia's Mount Sinabung recorded a significant increase in seismic activity on May 22, raising concerns about potential eruptions. Meanwhile, Great Sitkin in Alaska continues its slow lava eruption at ORANGE/WATCH alert, and Kīlauea's Halemaʻumaʻu eruption remains paused at ADVISORY/YELLOW.
Earthquake & Volcano Monitor — 2026-05-23
Seismic Activity
Campi Flegrei, Italy — M4.4 Triggers Swarm
A shallow M4.4 earthquake struck the Campi Flegrei caldera, located west of Naples, Italy, at 05:50 local time (03:50 UTC) on May 21, 2026, sparking a seismic swarm that ultimately comprised 12 earthquakes before activity subsided. The Campi Flegrei caldera — one of the world's most closely watched volcanic systems due to its proximity to densely populated areas — has been subject to ongoing bradyseismic unrest in recent years.
Volcanic Watch
Mount Sinabung, North Sumatra — Elevated Unrest
An increase in seismic activity was recorded at North Sumatra's Mount Sinabung on May 22, 2026. Authorities warn that the elevated unrest may lead to potential phreatic or magmatic eruptions. Mount Sinabung had been dormant for centuries before reawakening dramatically in 2010, and it remains one of Indonesia's most active and closely monitored volcanoes.
Great Sitkin, Alaska — Ongoing Lava Eruption (ORANGE/WATCH)
As of May 21, 2026 at 20:15 UTC, the Alaska Volcano Observatory (AVO) reports that a slow eruption of lava within the summit crater of Great Sitkin continues. The volcano remains at Aviation Color Code ORANGE and Alert Level WATCH — a status that has been in effect since July 2021 and reflects the persistent, low-level effusive activity at this Aleutian Island volcano.
Kīlauea, Hawaiʻi — Eruption Paused (ADVISORY/YELLOW)
The Halemaʻumaʻu eruption of Kīlauea is currently paused, according to the Hawaiian Volcano Observatory's most recent daily update. The volcano is now at Alert Level ADVISORY and Aviation Color Code YELLOW, indicating that unrest continues but active surface lava is not present at this time.
Sangay, Ecuador — Plumes Continuing
Recent reports confirm plumes reaching approximately 1 km above the summit at Ecuador's Sangay volcano, with activity persisting into the coverage period. Sangay is one of South America's most persistently active volcanoes.
Earth Science
Smithsonian/USGS Weekly Report: 27 Active Volcanoes
The Smithsonian Institution / USGS Weekly Volcanic Activity Report for the week ending May 20, 2026, documented ongoing or new activity at 27 volcanoes worldwide. The report serves as the authoritative global benchmark for tracking eruptive activity across all major volcanic systems.
Safety Note: Residents near Campi Flegrei and Mount Sinabung should monitor official civil protection alerts. Elevated seismic activity at either location can escalate quickly. Always follow guidance from national geological and volcanology agencies.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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