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The shallow Reykjanes reservoir has exceeded the volume that historically triggers fissures. The Icelandic Met Office measures 2 centimeters of ground elevation per month since the end of the last eruption.
The magma beneath Svartsengi, in the west of Iceland’s Reykjanes peninsula, reached over 25 million cubic meters in April 2026, according to the Icelandic Meteorological Office.
It is the largest recorded stock since the Sundhnúkur eruption series began in December 2023.
On April 30, Watchers.news published the measurement based on GPS modeling and ground deformation in the Grindavík region.
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According to the report, the magma chamber 4-5 km deep receives between 1 and 2 million cubic meters of molten rock per week.
In March 2025, the previous peak in the series marked about 23 million m³ before the ninth eruption.
In fact, the current recharge cycle is already the longest since 2023.
In other words, the empirical threshold that triggers a dike intrusion has already crossed the historical mark without the fissure opening.
Therefore, Icelandic Met Office teams maintain an orange alert level for the entire peninsula. The agency’s risk maps extend until June 30, 2026.
Nine eruptions in twenty months have reshaped Reykjanes
The Sundhnúkur series began on December 18, 2023. The event followed a seismic swarm of over 22,000 tremors in October and November of that year.
Since then, there have been nine effusive eruptions. The longest, which began on March 16, 2024, lasted 54 days and produced the largest lava field in the sequence.
According to records from Volcano Express, the most recent ended on August 5, 2025, with 21 days of activity.
According to the same source, this ninth eruption covered 3.3 km² with 26.8 million m³ of basalt. Subsequently, the volcano entered a prolonged recharge phase.
The sequence interrupted about 800 years of geological dormancy on the peninsula. The cycle resumed in 2021 with the neighboring Fagradalsfjall system.
To understand the scale, Reykjanes accounts for three-quarters of the country’s international tourism infrastructure. Furthermore, it is 25 kilometers from the capital, Reykjavík.
In practice, the Sundhnúkur–Svartsengi axis has become the world’s best-instrumented laboratory for active fissure eruptions. On the other hand, the frequency of events has transformed Iceland’s southwest coast into an intermittent evacuation zone.
Grindavík: 3,600 evacuated, 230 properties compromised, and US$71 million in damages
Grindavík had 3,600 residents before the escalation in November 2023. Since then, the Icelandic Civil Protection has ordered repeated evacuations.
According to the National Institute for Catastrophes in Iceland, more than 230 properties suffered direct damage from earthquakes, fissure openings, and lava flows.
The total damage amounts to 10 billion Icelandic krónur, equivalent to approximately US$71 million.
Furthermore, the Blue Lagoon, the country’s main geothermal spa, suspended operations several times for risk reassessment. Subsequently, it resumed activities under a rapid evacuation protocol.
According to operator records, the Svartsengi plant generates 75 megawatts of electricity and supplies the resort and regional heating.
The plant now features lava barriers up to 20 meters high, built during the series.
Consequently, the barrier system has been reinforced with each eruption. Today it includes diversion channels, monitoring platforms, and pumps capable of cooling the lava front with seawater.
Additionally, Reykjavík authorities have not yet determined whether parts of Grindavík will become permanently habitable again.
Two centimeters per month: the geophysical signature of magma beneath Svartsengi
Ground deformation measured in the Svartsengi basin has been rising at 2 cm per month.
In comparison, the normal uplift rate in inactive volcanic zones is usually a few millimeters per year.
According to the Icelandic Met Office monitoring team, this pattern is the same signature of magma beneath Svartsengi that preceded each of the nine eruptions in the current series.
Consequently, the Volcanic Alert Level System (VALS), a scale created specifically for the Reykjanes crisis, maintains the orange stage. The system classifies seven physical threats on the current map.
According to the IMO, threats include deformation and fissure opening, sinkholes, surface faulting, eruptive fissure opening, lava flow, tephra, and contamination by volcanic gases.
In practice, the time between the start of the precursor earthquake and the opening of the fissure is between 20 minutes and 4 hours. Technicians measured this interval in each of the nine previous eruptions.
Why no one can say the exact day
The location of the next rupture appears in models with an error of a few meters. Even so, the exact moment remains unpredictable.
In an interview with Quanta Magazine in May 2026, seismologist Tom Winder, from the University of Iceland, described the current spatial prediction as “relatively unusual in the world.”
Still, Winder emphasized that pinpointing the exact day remains a task for decades of research.
According to the researcher, the forces that decide whether the chamber yields today or in three months involve magma pressure, crustal stress, and rock flow properties.
On the other hand, even with Iceland’s network of GPS, seismographs, and gas sensors, this limit remains opaque.
In parallel, similar behavior appears in the submarine Kolumbo, north of Santorini, which recorded 28,000 tremors in the last month.
In turn, the Sundhnúkur sequence has already produced nine events with similar recharge curves. This supports the expectation that the next fissure will open in the coming weeks.
The current accumulation has already exceeded 210 direct days beneath the peninsula, according to the Met Office’s count.
Geothermal energy continues, and Iceland still wants to intentionally drill into magma
Despite the risk, the Icelandic geothermal sector has not interrupted operations during the series.
According to the operator, the Svartsengi plant has been generating uninterrupted energy for 47 years. The surplus goes to the national grid, and the heat supplies urban heating.
In parallel, Iceland continues with the Krafla Magma Testbed project. The initiative aims to drill directly into magma to extract geothermal energy up to ten times more powerful than conventional.
The first dedicated well is scheduled to be drilled in 2026. According to the responsible team, the technology would transform the current recharge curve into direct industrial input.
On the other hand, Keflavík, the country’s main airport 12 km from Sundhnúkur, did not interrupt flights during any of the nine eruptions.
Unlike the 2010 Eyjafjallajökull event, the Reykjanes fissures produce lava fountains and basaltic flows, without ash capable of paralyzing European air traffic.
Limitations of the forecast for magma beneath Svartsengi
- 25.5 million m³ of magma beneath Svartsengi (IMO measurement, Apr 30, 2026)
- 2 cm/month of continuous ground elevation in the geothermal basin
- 9 consecutive eruptions since December 2023 along the Sundhnúkur axis
- 20 minutes to 4 hours lead time between precursor earthquake and fissure opening
- 3,600 evacuated and 230 properties damaged in Grindavík
Would Brazil have the capacity to monitor an active volcano in a capital’s backyard with the same precision?
Iceland shows what can be done when the seismograph network covers every square kilometer of the risk zone.
On the other hand, it also shows that no model can yet pinpoint the day the fissure will open.
According to the Icelandic Met Office, the most likely scenario points to a new fissure along the Sundhnúkur crater row.
Still, part of the magma may remain dammed for several more weeks before erupting. In a less likely scenario, it could generate a dike intrusion without reaching the surface.
Indeed, Civil Protection maintains the evacuation protocol on standby until at least June 30, 2026. It is worth remembering that the reservoir shows no signs of stabilization at this recharge rate.
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