Magma accumulation beneath Svartsengi now largest since eruption sequence began, Iceland

More than 23 million m³ (812 million feet³) of magma have accumulated beneath the Svartsengi volcanic system on Iceland’s Reykjanes Peninsula since the July 2025 eruption. Monitoring data released March 17, 2026, by the Icelandic Meteorological Office show this is the largest magma accumulation between eruptions since activity began on the Sundhnúksgígar crater row in December 2023. The official hazard assessment for the area remains unchanged and is valid until March 31. Source