The fissure eruption in the W part of the Krýsuvík-Trölladyngja volcanic system, close to Fagradalsfjall on the Reykjanes Peninsula, continued during 23-29 June. Lava fountaining and overflows from the fifth vent were periodically visible, and lava from the crater flowed in tubes as well as on the surface. The Institute of Earth Sciences noted that during 11-26 June the lava effusion rate averaged 13 cubic meters per second, which was high but similar to rates during May. The area of the flow field had grown to 3.82 square kilometers, and the total volume erupted was 80 million cubic meters. Lava flows thickened 10-15 m in the Meradalir Valley, 15 m in the Nátthaga Valley, and 20 m in the S and E part of Geldingadalur. The Aviation Color Code remained at Orange due to the lack of ash and tephra emissions, though IMO warned of the potential for lapilli and scoria fallout within a 650 m radius of the active vent. Authorities warned of increased gas emissions hazards.

Geological Summary. Although the Fagradalsfjall fissure swarm has previously been considered a split or secondary swarm of the Krýsuvík–Trölladyngja volcanic system, as of September 2022 Icelandic volcanologists managing the Catalogue of Icelandic Volcanoes made the decision to identify it as a distinct separate system. The recent eruptions and related reports have been reassigned here, and other content will be prepared and adjusted as appropriate.

Sources: Icelandic Meteorological Office (IMO), Institute of Earth Sciences