More than 25 million m³ (883 million ft³) of magma has accumulated beneath Svartsengi, Iceland, since the last eruption in July 2025, the Icelandic Meteorological Office (IMO) reported on April 28, 2026. IMO said ground uplift continues at up to 2 cm (0.8 inches) per month, while magmatic dike propagation toward the Sundhnúkur crater row remains the most likely scenario and could lead to an eruption.
Around 6 to 7 million m3 (212 to 247 million ft3) of magma have accumulated beneath Svartsengi, Iceland since the eruption on July 16, 2025. At the current rate of accumulation, the estimated threshold of 12 million m3 (424 million ft3) could be reached in the latter half of September, increasing the likelihood of a new eruption.
While the eruption at the Sundhnúksgígar crater row, southeast of Litla-Skógfell, Iceland continues on July 18, 2025, the eruptive activity has declined in the last 24 hours.
A fissure eruption began at the Sundhnúksgígar crater row, southeast of Litla-Skógfell, Iceland, around 03:54 UTC on July 16, 2025. The eruptive fissure is approximately 700–1 000 m (2 300–3 280 feet) long and appears to be propagating northward, with lava flowing southeast and no immediate threat to infrastructure.
A new volcanic eruption has just begun north of the dam near Grindavík, Iceland, the Icelandic Met Office (IMO) reported at 09:45 UTC. A Coast Guard helicopter was sent to confirm the exact location and size of the eruption. This is the 11th eruption on the Reykjanes Peninsula since 2021 and the 9th on the Sundhnúk crater series.
Magma accumulation beneath Svartsengi has reached its highest recorded level since the beginning of the ongoing eruption series in December 2023. The volume of magma beneath Svartsengi is now greater than what was recorded before the November 2024 eruption.
Magma accumulation beneath Svartsengi has reached a critical volume, matching the levels observed during the last eruption on November 20, 2024. A volcanic eruption could occur at very short notice, potentially within days or weeks, according to the IMO. The IMO has revised its hazard assessment which remains in effect until February 25.
Magma accumulation beneath Svartsengi is nearing the critical threshold, with over 90% of the volume recorded before the last eruption on November 20, 2024, increasing the likelihood of a dike intrusion and possible eruption. Seismic activity remains steady, and land uplift continues.
A civil defense project to further raise earthen dams around the Svartsengi Power Plant was initiated on December 9, 2024. The effort aims to safeguard the infrastructure against future lava flows.
Eruptive activity near Grindavik, Iceland, remains steady on November 28, 2024, with the eruption continuing from a single vent and lava flowing east and southeast. Gas pollution caused by northeast winds at 35 – 55 km/h (20 – 35 mph) was moving toward Grindavík today and was forecast to spread to nearby areas as the weather patterns change.
