mountain Keilir. The magmatic dike to the southwest Keilir has a length of about 5 km. On the evening of 19 March 2021 at around 20:45 local time, a volcanic eruption began at Fagradalsfjall mountain, some 15 km northeast of Grindavík. The eruption was small and effusive, from a 500–800 m long fissure; National Geographic predicted that this volcano was unlikely to threaten "any population centers". See also Volcanism of Iceland Geology of Iceland List of volcanoes in Iceland List of volcanic eruptions in Iceland Geological deformation of Iceland Global Volcanism Program References External links Geotourism on Reykjanes Peninsula. Visit Reykjanes. Official website. Geologist Páll Einarsson explains the geology of Reykjanes as well as the 2020 earthquake series. RÚV. 20 October 2020. (in Icelandic) Reykjanes Southern Peninsula (Iceland) Volcanism of Iceland Reykjanes