Santorini sits on the Hellenic Volcanic Arc, and small tremors are a normal, near-constant background feature of the island's geology — almost always unnoticed by visitors. In early 2025, that background activity became a genuinely significant event worth understanding, even though the situation has since stabilised.
What happened in February 2025
Starting in late January 2025, the sea area between Santorini and the neighbouring island of Amorgos experienced a major earthquake swarm — thousands of tremors, most minor, but including several in the magnitude 4-5 range and a peak of magnitude 5.2-5.3 on February 10. The Greek government declared a state of emergency on Santorini, Amorgos, Ios and Anafi, schools closed, and a significant portion of the islands' population and workers evacuated as a precaution — reports at the time cited over 11,000 people leaving Santorini alone. No major structural damage or injuries were reported.
Tectonic, not volcanic
Greek seismologists identified the event as a tectonic earthquake swarm along fault lines between Santorini and Amorgos — not volcanic unrest beneath Santorini's own caldera. This distinction matters: it means the swarm was not a precursor to the kind of eruption covered in our eruption history guide. Santorini has experienced comparable seismic swarms before, including one in 2011-2012, without any eruption resulting.
What happened next
The state of emergency was lifted on March 3, 2025. Seismic activity declined steadily through March and April, and by May 2025 the Greek government had declared the island fully safe, with tourism infrastructure and all ports operating normally again. Independent reporting since has described the situation as stable, with activity levels returned to the low background rate typical of the region.
What this means if you're planning a trip now
As of publication, the 2025 swarm is a resolved, past event — the island has operated normally for well over a year since. That said, this is exactly the kind of situation that can change with little warning, so:
- Check current advisories from your government's travel advisory service and the Greek Ministry of Climate Crisis and Civil Protection shortly before travel, not from this page alone.
- If you're already on the island and feel a tremor, move away from cliff edges and old stone structures, and follow any instructions from local authorities — standard earthquake safety practice applies.
- Travel insurance that covers natural-disaster disruption is worth having regardless of current conditions, given the island's underlying geology — see our travel insurance and safety guide.
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