What Happened
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Fissure eruption: Magma pushed through a crack approximately 700 to 1,000 m long in the Sundhnúksgígar crater row near Litla‑Skógfell, producing glowing lava flows and smoke
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No immediate threat: The IMO described the eruption as “relatively small” and not threatening infrastructure; no disruptions were reported at Keflavík airport or Reykjavík.
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Evacuations: Nearby residents and visitors—particularly around Grindavík and the Blue Lagoon—were evacuated as a precaution. The town, with around 4,000 residents before 2023, remains largely empty between eruptive events
Geological Context
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Reactivation zone: Reykjanes had been dormant for about 800 years until activity resumed with the Geldingadalir eruption in March 2021
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Eruption count: Since then, the region has experienced 12 eruptions—3 in the Fagradalsfjall system (2021–23) and 9 along the Sundhnúkur row (Dec 2023–July 2025
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Extended volcanic phase: Experts warn this period may last decades or centuries, similar to historical “Reykjanes Fires” cycles .
Local Impact & Defensive Measures
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Protective barriers: Lava diversion walls and dykes built since 2023 have helped protect Grindavík, the Blue Lagoon spa, and critical pipelines from lava flow Infrastructure resilience: No homes, utilities, or roads were harmed this time, reflecting improved preparedness and monitoring
Monitoring & Forecast
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Seismic alert: IMO continues to track earthquakes, ground movement, and magma intrusion via seismic stations and GPS networks.
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Eruption outlook: Analysts predict a high probability of further eruptions, potentially starting again in autumn 2025
Public & Travel Guidance
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Air traffic unaffected: Both Reykjavik and Keflavík airports remained fully operational, with no disruptions to flights reported
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Visitor safety: Tourists are advised to avoid restricted zones. Popular attractions like the Blue Lagoon remain under safety protocols and limited access .
Why It Matters
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Volcanic resurgence: The 12th eruption reaffirms Reykjanes as one of Iceland’s most dynamically active volcanic regions.
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Adaptation works: Early warnings and strategic infrastructure defense have protected lives and property so far.
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Scientific insight: Each eruption enhances the understanding of fissure eruption behavior vital for risk management and forecasting.
Looking Ahead
With ongoing magma movement beneath the crust and frequent minor eruptions, Iceland’s Reykjanes Peninsula remains on high alert. Geologists and civil defense teams will keep monitoring cracks, seismic signals, and gas emissions as they prepare for the next event.
Bottom line: Iceland’s twelfth eruption is a controlled yet vivid reminder of Earth’s geothermal force. While safely contained, it signals the start of a long-term volcanic phase—underscoring the importance of vigilance and resilience in one of nature’s most spectacular settings.