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The southern tip of the EVZ propagating rift is an off rift region called the South Iceland volcanic zone (SIVZ), that often has more evolved magma and thus explosive eruptions. [68] North of Iceland, the Mid-Atlantic Ridge is called Kolbeinsey Ridge (KR) and is connected to the NVZ via the Tjörnes fracture zone (TFZ).
Iceland experiences frequent volcanic activity, due to its location both on the Mid-Atlantic Ridge, a divergent tectonic plate boundary, and being over a hotspot.Nearly thirty volcanoes are known to have erupted in the Holocene epoch; these include Eldgjá, source of the largest lava eruption in human history.
Fagradalsfjall is also the name for the wider volcanic system covering an area 5 kilometres (3 mi) wide and 16 kilometres (10 mi) long between the Svartsengi and Krýsuvík systems. [17] No volcanic eruption had occurred for 815 years on the Reykjanes Peninsula until 19 March 2021. Part of the Reykjanes volcanic zone (RVZ).
Öræfajökull (Icelandic pronunciation: [ˈœːrˌaiːvaˌjœːkʏtl̥] ⓘ; 'Öræfi glacier' or 'wasteland glacier') is an ice-covered volcano in south-east Iceland. The largest active volcano and the highest peak in Iceland at 2,110 metres (6,920 ft), it lies within the Vatnajökull National Park and is covered by part of the glacier.
In the case of Iceland, this type of eruption is the cause of massive plumes of volcanic ash that migrate to Europe and disrupt air traffic. [20] Historically these explosive eruptions have had other impacts on human civilization as well, including acid rain and significant changes in weather patterns. [ 18 ]
Grímsvötn is a basaltic volcano which has the highest eruption frequency of all the volcanoes in Iceland. It has a southwest-northeast-trending fissure system. The massive climate-impacting Laki fissure eruption of 1783–1784 took place in a part of the same Grímsvötn-Laki volcanic system. [3]
The Hofsjökull volcanic system (also Hofsjökull-Kerlingarfjöll volcanic system) contains the largest active central volcano in Iceland. [3] It is called Hofsjökull ( Icelandic : " temple glacier", Icelandic pronunciation: [ˈhɔfsˌjœːkʏtl̥] ⓘ ), after the icecap of the same name.
Katla (Icelandic pronunciation: ⓘ) is an active volcano in southern Iceland. This volcano has been very active historically with at least twenty documented major eruptions since 2920 BC. In its recent history though, Katla has been less active as the last major eruption occurred in 1918.