One year has passed since the last volcanic eruption on the Reykjanes peninsula — the most recent in a series that began in December 2023 and reshaped Iceland’s volcanic landscape. Scientists at the Icelandic Meteorological Office (Veðurstofa Íslands) continue to monitor elevated seismic activity on the peninsula, and the question on everyone’s mind remains the same: is another eruption coming?
Key takeaways
- The most recent Reykjanes eruption ended roughly one year ago, part of an ongoing volcanic episode that began in late 2023.
- The Reykjanes volcanic system remains active in 2025, with regular earthquake swarms recorded by Veðurstofa Íslands.
- Grindavík, the town closest to the eruption sites, has seen partial repopulation but still faces restrictions in some zones.
- Scientists say another eruption on Reykjanes is likely eventually — the system has not returned to a dormant state.
- The peninsula is largely open to visitors, though travellers should check official sources before approaching active fissure areas.
When Was the Last Eruption on the Reykjanes Peninsula?
The Reykjanes peninsula has experienced a sequence of eruptions since December 2023, all originating from the Svartsengi volcanic system near Grindavík — a fishing town of roughly 3,400 people located about 50 kilometres southwest of Reykjavík. The eruptions followed months of intense ground deformation and earthquake activity that forced the evacuation of Grindavík in November 2023.
The most recent eruption in this cycle concluded approximately one year ago, making this anniversary a natural moment to assess what has changed. Each eruption in the sequence has originated from fissures on the Reykjanes peninsula, sending lava flows across the lava fields northeast of Grindavík and, in some cases, threatening the town’s infrastructure directly.
Is the Reykjanes Volcano Still Active in 2025?
Yes. The Svartsengi system remains active. Veðurstofa Íslands continues to record earthquake swarms and ground deformation consistent with magma accumulating at depth beneath the Reykjanes peninsula. Officials have made clear that the current eruptive episode — which geologists consider a reawakening of a volcanic system that had been dormant for roughly 800 years — is not over.
Since late 2023, the peninsula has experienced multiple distinct eruption events in relatively quick succession. Scientists describe the pattern as a recharging system: magma builds in a shallow reservoir beneath Svartsengi, ground levels rise measurably, and eventually pressure triggers a new fissure eruption. That cycle has repeated several times and, according to monitoring data, conditions consistent with another recharge phase have been observed in 2025.
Importantly, these are effusive eruptions — lava flows rather than explosive ash columns — which means the hazard profile differs significantly from the 2010 Eyjafjallajökull eruption that disrupted European air travel. Flight disruptions from a Reykjanes eruption are unlikely unless conditions change substantially.
What Has Changed on the Reykjanes Peninsula Since the Last Eruption?
The past year has brought significant change to the peninsula, both on the ground and in policy.
Grindavík and the surrounding area
Grindavík residents were evacuated multiple times during the eruption cycle. Since the last eruption ended, a portion of the population has returned, though certain areas of the town closest to the lava hazard zones remain restricted or have sustained lava damage. Protective berms — earth walls constructed by Icelandic authorities to deflect lava flows — were built around parts of the town and around the Svartanes geothermal infrastructure. Some of those defences have since been reinforced.
The Blue Lagoon (Bláa Lónið), the world-famous geothermal spa located just outside Grindavík, closed repeatedly during eruption events. It has since reopened and is currently welcoming visitors. Staff at the spa have become accustomed to operating under a contingency model, with evacuation plans reviewed regularly.
Infrastructure and monitoring
The Icelandic Road and Coastal Administration (Vegagerðin) repaired sections of Route 43 and other peninsula roads damaged or buried during the eruption sequence. New monitoring instruments have been installed across the peninsula, giving scientists faster warning times. Officials have also revised the civil protection framework, meaning local authorities can now issue evacuation orders more rapidly based on pre-agreed trigger thresholds.
New lava fields
Significant new lava fields now cover parts of the peninsula that were open heath and gravel road just two years ago. Hikers and photographers have already begun exploring the cooled lava margins, and guided volcano tours departing from Reykjavík have incorporated the new terrain into their routes. The raw, black lava landscape visible from the road near Grindavík is a striking reminder of how quickly Iceland’s surface can change.
Is Another Eruption Expected Soon on Reykjanes?
Scientists are careful not to give specific dates, because eruption timing remains difficult to predict precisely. However, officials at Veðurstofa Íslands have been consistent: the Reykjanes eruptive episode is ongoing, and another eruption is considered probable rather than merely possible. The key question is when, not if.
Monitoring data in 2025 has shown periods of accelerated ground uplift near Svartsengi, which scientists interpret as renewed magma inflow. When uplift rates increase sharply and earthquake activity clusters around known fissure corridors, authorities raise the alert level and, if thresholds are met, issue precautionary notices for the Grindavík area.
For comparison, the intervals between eruptions in this cycle have ranged from a few weeks to several months. A longer quiet period does not indicate the system is shutting down — it may simply reflect a slower recharge rate.
Is It Safe to Visit the Reykjanes Peninsula Now?
For most visitors, yes — the Reykjanes peninsula is open and accessible. The Blue Lagoon is operating. The scenic Reykjanes UNESCO Global Geopark, which covers the entire peninsula, is open for hiking and sightseeing. The famous Bridge Between Continents (Brúin milli heimsálfa), a short walk from Route 425 near Sandvík, is accessible and popular with tourists.
However, travellers should take practical precautions:
- Check the Veðurstofa Íslands website and the Icelandic Civil Protection (Almannavarnir) channels before visiting areas near Grindavík or active fissure zones.
- Follow all road closure signs. Access to lava hazard zones near Grindavík can change within hours if activity increases.
- The Blue Lagoon advises guests to confirm their booking status on the day of a visit during periods of elevated volcanic unrest.
- Guided volcano tours from operators based in Reykjavík provide the safest way to approach new lava fields, as guides monitor official alerts in real time.
- Visitors arriving or departing via Keflavík International Airport (Leifsstöð) should note that the airport itself is not in the primary hazard zone, but road access can occasionally be disrupted during eruptions.
The broader Reykjanes peninsula experience — birdwatching at Krýsuvík, the Reykjanestá lighthouse at Iceland’s southwestern tip, the geothermal hot springs at Seltún — remains fully accessible and far from active eruption zones.
What This Anniversary Means for Iceland’s Volcanic Future
Geologists describe the current Reykjanes activity as a volcanic episode likely to continue for decades, possibly centuries — a pattern consistent with previous active periods in the peninsula’s geological history. The last comparable episode ended around 1240 CE. This long-term perspective is important context for both residents and policymakers.
Grindavík’s future as a permanent settlement is under active political and social discussion. The Alþingi, Iceland’s parliament, has debated compensation frameworks for affected residents. Some families have chosen not to return, while others have rebuilt. The community’s resilience has been widely noted, but the uncertainty is real and ongoing.
For international visitors, the Reykjanes situation is a reminder that Iceland is one of the most volcanically active places on Earth — and that this is, simultaneously, one of its greatest attractions and one of its most serious ongoing challenges.
Frequently Asked Questions
When exactly did the last Reykjanes eruption end?
The most recent eruption in the Svartsengi volcanic system concluded approximately one year ago, marking the latest in a sequence of eruptions that began in December 2023. The precise end date of each individual eruption has varied, as activity sometimes paused and resumed across multiple fissure openings. Veðurstofa Íslands documented the cessation of each eruptive phase in real time on its official monitoring pages.
Has Grindavík fully reopened after the eruptions?
Grindavík has partially reopened. A number of residents have returned and some businesses have resumed operations, but sections of the town closest to the lava hazard zone remain restricted or were destroyed by lava flows. The situation continues to evolve, and visitors should not enter restricted zones. Icelandic civil protection authorities post current access information on the Almannavarnir website.
Will a new Reykjanes eruption disrupt flights from Keflavík?
Eruptions in the current Reykjanes cycle are effusive — meaning they produce lava flows rather than large ash clouds — so significant flight disruption is unlikely under current conditions. Keflavík International Airport has remained open throughout the eruption sequence. Travellers should monitor Isavia (the airport operator) and their airline for any updates if activity escalates unexpectedly.
Is the Blue Lagoon open in 2025?
Yes, the Blue Lagoon (Bláa Lónið) is currently open to visitors. It has closed temporarily on several occasions since late 2023 due to nearby eruptions, but it has also reopened each time once conditions allowed. Guests are advised to confirm their reservation status directly with the Blue Lagoon on the day of their visit during any period of elevated volcanic unrest.
How can I stay informed about Reykjanes volcanic activity before my trip?
The most reliable source is the Icelandic Meteorological Office at en.vedur.is, which publishes real-time earthquake and eruption data in English. The Icelandic Civil Protection agency (Almannavarnir) issues official safety notices and road closure information. The Safe Travel Iceland website (safetravel.is) also aggregates current hazard information for international travellers.
