One year after the last volcanic eruption near Grindavík, a leading Icelandic volcanologist says the eruption cycle that has defined life on the Reykjanes Peninsula for the past several years appears to have finally run its course. According to Morgunblaðið (mbl.is), volcanologist Þorvaldur Þórðarson believes the series of eruptions is most likely at an end.
Key takeaways
- Today, 16 July 2026, marks one year since the last volcanic eruption near Grindavík.
- Volcanologist Þorvaldur Þórðarson says the Reykjanes eruption cycle is likely over.
- The eruption series began in 2021 and repeatedly threatened the town of Grindavík and the Svartsengi geothermal system.
- No new eruption has occurred on the peninsula in the past twelve months.
- Scientists will continue to monitor the area closely for signs of renewed magmatic activity.
The significance of that assessment is hard to overstate for residents of the Reykjanes Peninsula. Grindavík, a fishing town of roughly 3,000 people, endured repeated evacuations, lava flows that destroyed homes, and months of uncertainty as eruption followed eruption across a volcanic system that had been dormant for eight centuries before reawakening in 2021.
For a full year now, the ground has been quiet.
What Þorvaldur Þórðarson says about the Grindavík eruption cycle
Þorvaldur Þórðarson is one of Iceland’s most respected volcanologists, known internationally for his research into large igneous events and effusive eruption systems. His view that the current cycle has ended carries weight in a scientific community that has watched the Svartsengi volcanic system closely since the first fissure opened at Fagradalsfjall in March 2021.
Reports indicate he assessed the situation as of 16 July 2026 — exactly one year after the most recent eruption — and concluded that the pattern of activity that has characterised the peninsula in recent years appears to have exhausted itself, at least for now. The eruption cycle on the Reykjanes Peninsula is, in his assessment, most likely over.
That is not a guarantee. Iceland sits directly on the Mid-Atlantic Ridge, where the Eurasian and North American tectonic plates pull apart at roughly 2.5 centimetres per year, and volcanic systems here do not follow predictable schedules. But a twelve-month pause, combined with Þórðarson’s reading of the underlying geology, is the most encouraging signal the peninsula has produced in years.
How the eruption series unfolded near Grindavík
The sequence that now appears to be closing began quietly enough, with the 2021 Fagradalsfjall eruption drawing curious hikers to lava fields just a short drive from Reykjavík’s suburbs. Those early eruptions felt almost benign — remote, accessible, spectacular in the way that only Icelandic volcanism can be. The mood shifted when activity migrated closer to infrastructure and to people.
By late 2023 and into 2024, eruptions near Grindavík were no longer a spectacle for sightseers. Lava destroyed roads. It breached defensive berms. It reached the edge of town. The Icelandic Meteorological Office (Veðurstofa Íslands) and the Department of Civil Protection issued repeated alerts, and thousands of residents spent extended periods away from their homes, staying with relatives or in temporary accommodation across the country.
The Svartsengi geothermal power plant — which supplies heat and hot water to tens of thousands of homes across the peninsula and feeds the famous Blue Lagoon spa — faced persistent threat. Engineers worked to protect critical infrastructure through successive eruption events, and the plant was briefly taken offline during the most acute periods of activity.
Each time an eruption ended, the question was not whether the next one would come, but when. The interval between events shortened through much of 2024, feeding anxiety among residents and complicating the long-term recovery effort in Grindavík itself, where some streets remained uninhabitable and the social fabric of the community was stretched thin.
Is it safe to visit the Reykjanes Peninsula now?
The eruption sites themselves — the scarred lava fields between Grindavík and Þorbjörn hill, the hardened flows that buried sections of the road to Grindavík — have become part of the landscape. Access to various areas has opened and closed repeatedly over the past few years depending on volcanic activity, gas levels, and civil protection decisions.
With a year of quiet behind it, the peninsula is largely accessible. Grindavík has been rebuilding. The Blue Lagoon, which closed multiple times during the eruption cycle, has reopened. Visitors driving the familiar route along Route 43 from Keflavík toward the town will see the evidence of what happened — dark, ropey lava fields pushing right up to the road’s edge in places — but the immediate hazard, for now, appears to have passed.
Authorities have not issued any current volcanic alert for the area, though monitoring continues around the clock. Anyone travelling to the peninsula should check the latest status with Veðurstofa Íslands before venturing close to recent lava fields, where ground conditions can remain unstable and gas emissions are possible even without active eruption.
What scientists will watch for next on Reykjanes
Even if this particular eruption cycle is over, the Reykjanes Peninsula will remain one of the most volcanically active stretches of land in Europe. The ridge system that runs beneath it is geologically restless, and the historical record — including the previous active period that ended around 1240 AD — suggests that these cycles, once initiated, can produce activity for decades before quieting again.
Scientists will track ground deformation data, seismic tremor patterns, and GPS measurements at monitoring stations across the peninsula. Any significant inflation of the Svartsengi system — indicating fresh magma accumulating underground — would be an early warning signal. For now, those readings have stayed calm enough to justify cautious optimism.
Whether this anniversary marks a true ending or simply an extended pause, the coming months of geological data will go a long way toward answering that question.
Frequently asked questions
When was the last volcanic eruption near Grindavík?
The most recent eruption near Grindavík occurred on 16 July 2025, making today, 16 July 2026, the one-year anniversary of that event. No new eruption has taken place on the Reykjanes Peninsula in the intervening twelve months.
Has the Reykjanes eruption cycle really ended?
Volcanologist Þorvaldur Þórðarson has assessed the cycle as most likely over, according to Morgunblaðið. However, Iceland’s volcanic systems are inherently unpredictable, and scientists will continue monitoring the area. A twelve-month pause is encouraging but does not constitute a definitive guarantee of inactivity.
Is Grindavík open and safe to visit in 2026?
Grindavík is open and has been in a period of rebuilding following the eruption series. The Blue Lagoon has also reopened. Visitors are advised to check the latest volcanic and civil protection alerts with Veðurstofa Íslands before travelling close to recent lava fields, as ground conditions in those areas can remain unstable.
How long did the Reykjanes eruption series last?
The current volcanic period on the Reykjanes Peninsula began with the Fagradalsfjall eruption in March 2021 and produced multiple eruption events over roughly four years. The series increasingly threatened Grindavík from late 2023 onward, with lava destroying homes and infrastructure before the most recent eruption in July 2025.
What monitoring is in place on the Reykjanes Peninsula?
The Icelandic Meteorological Office (Veðurstofa Íslands) operates continuous monitoring across the peninsula, tracking seismic activity, ground deformation via GPS, and gas emissions. Any significant magma accumulation beneath the Svartsengi system would be detected through these networks and would prompt updated public alerts.
Original source: Morgunblaðið (mbl.is)
