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Sundhnúkur Volcano Unleashes 2.4 km Fissure in 12th Reykjanes Eruption, Triggers Precautionary Evacuations

Authorities warned of rising sulfur dioxide levels, urging residents to shelter indoors.

Overview

  • An intense seismic swarm at 1:20 a.m. signaled magma intrusion and prompted the swift evacuation of Grindavík and the Blue Lagoon resort.
  • Satellite data show the main fissure has extended about 2.4 km, with lava flowing southeast away from roads and buildings.
  • High sulfur dioxide concentrations led officials to advise residents in Reykjanesbær and Vogar to keep windows closed and turn off ventilation.
  • Keflavik International Airport remained fully operational with no flight delays or airspace restrictions despite the gas plume.
  • As the 12th eruption since 2021, this event underscores ongoing investments in monitoring, lava diversion barriers and property acquisitions to manage persistent volcanic risk.