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15-590: Helgafell may refer to: Helgafell (Hafnarfjörður) , a mountain 338 m (1,109 ft), on the Reykjanes peninsula , south-west Iceland Helgafell, a mountain 217 m (712 ft), in Mosfellsbær north-east of Reykjavík Helgafell, a mountain at 362 m (1,188 ft), in Rangárþing eystra , south-central Iceland Helgafell (Vestmannaeyjabær) ,

30-476: A fissure opened at right angles to the ice flow, which was from the southeast to the northwest. It was about 15 km from the glacier snout . There is a big terminal moraine at the coast at Álftanes . Rapid ice melting was the consequence of explosive eruption and therefore magma fragmentation from the start of the eruption. At Helgafell next an edifice was formed about 300 m high in an ice vault, meltwater drained away very fast through subglacial channels so that

45-508: A small intermittent river nearby. The area around it is fenced in, because it is part of the drinking water resources of the neighboring towns. Folk tales “explain” the disappearances of the river: Once a man could use witch craft, but lost two of his sons who drowned in the river. He shall then have used some of his tricks so that the river had to go underground. The mountain is relatively close to Hafnarfjörður as well as to Reykjavík . Many hiking trails are in its vicinity and also up on

60-674: A volcano 227 m (745 ft) on the island of Heimaey, south-east Iceland Helgafell (Sveitarfélagið Stykkishólmur) , a hill 73 m (240 ft), in Snæfellsnes, western Iceland Helgafell, a mountain at 549 m (1,801 ft), in Ísafjarðarbær , north-west Iceland Helgafell, a mountain at 301 m (988 ft), in Húnaþing vestra , north-west Iceland Helgafell, a mountain at 460 m (1,510 ft), in Langanesbyggð , north-east Iceland Topics referred to by

75-520: Is different from Wikidata All article disambiguation pages All disambiguation pages Helgafell (Hafnarfj%C3%B6r%C3%B0ur) Many mountains in Iceland bear the name of Helgafell . It means “ holy mountain ” and is thought that in the Viking era, these mountains played a special – if unknown – role in the worship of their gods. An architect from Reykjavík measured out the positions of

90-406: Is exceptionally large. Monogenetic fields occur only where the magma supply to the volcano is low or where vents are not close enough or large enough to develop plumbing systems for continuous feeding of magma. Monogenetic volcanic fields can provide snapshots of the underlying region beneath the surface, and may be useful in studying the generation of magma and the composition of the mantle since

105-561: Is located in a tectonically and volcanically active region: the last eruption on Reykjanes peninsula in February 2024. The mountain is situated within the area of the Krýsuvík volcanic system . It “is thought to have formed in a single subglacial fissure eruption under at least 500 m of glacial ice“. The original ridge was about 2km long. Some Holocene lava flows, also from the neighbouring Brennisteinsfjöll volcanic system, surrounded

120-473: The Holocene and other parts of the mountain slumped . The lava fields surrounding Helgafell today are about 40–80 m in thickness as gravity surveys showed. Kaldársel is a hut run by an Icelandic youth organization (KFUM) where hikers also are welcome. It is possible to get by car along Kaldárselsvegur from Hafnarfjörður up to a parking lot in the vicinity. The hut has its name from Kaldá ,

135-586: The Michoacán-Guanajuato volcanic field , which erupted from 1943 to 1952. Some monogenetic volcanoes are small lava shields , such as Rangitoto Island in the Auckland volcanic field . Other monogenetic volcanoes are tuff rings or maars . A monogenetic field typically contains between ten and a hundred volcanoes. The Michoacán-Guanajuato field in Mexico contains more than a thousand volcanoes and

150-644: The Pleistocene as well as the mountain Húsfell in a certain distance). Monogenetic volcano A monogenetic volcanic field is a type of volcanic field consisting of a group of small monogenetic volcanoes , each of which erupts only once, as opposed to polygenetic volcanoes , which erupt repeatedly over a period of time. The small monogenetic volcanoes of these fields are the most common subaerial volcanic landform. Many monogenetic volcanoes are cinder cones , often with lava flows, such as Parícutin in

165-408: The explosive activity continued to the end, which seems to have been after some days. This explains the fact, that Helgafell is next to overall made from mafic hyaloclastite , whereas most other researched smaller subglacial volcanoes showed a basis of pillow lavas . Of these and some small intrusions , the researchers just found minimal quantities. Aeolian erosion removed part of the summit in

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180-456: The mountain later. Helgafell is made mostly from palagonite , i.e. palagonitized tephra , dikes and a small amount of pillow lava . Helgafell is most probably a monogenetic subglacial mound , because no traces of subaerial eruptions were found on its slopes. The ice sheet under which the Helgafell eruptions took place, was about 500 m thick at time of eruption. In the beginning

195-496: The mountain, so that it is a very popular hiking area. There are also two long hiking trails at the base of the mountain: the Reykjavegur which makes it possible to hike all the length of Reykjanes Peninsula (about 120 km) and the old trail of Selvogsgata . It is a rather easy hike up on the mountain and even easier to hike around it or just up on Valahnúkarskarð between Helgafell and Valahnúkar (another subglacial mound from

210-454: The same term [REDACTED] This disambiguation page lists articles associated with the title Helgafell . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Helgafell&oldid=1212623456 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description

225-621: The very old cairn on top of Helgafell as well as the cairns of two other mountains in the vicinity and came to the conclusion that by using the positions of the sun as well as the shades of the cairns, the Vikings had constructed a calendar. The mountain is a hyaloclastite ridge formed during the Weichselian glaciation of the Pleistocene epoch. Its typical form shows well as there is not much vegetation on its slopes. Helgafell

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