Vatnafjöll

Vatnafjöll
Vatnafjöll is located in Iceland
Vatnafjöll
Vatnafjöll
Highest point
Elevation1,235 m (4,052 ft)
Coordinates63°55′12″N 19°40′12″W / 63.92000°N 19.67000°W / 63.92000; -19.67000
Geography
LocationIceland
Geology
Rock ageTephrochronology
Mountain typeFissure vents of Hekla
Last eruption1200 years ago

Vatnafjöll (Icelandic pronunciation: [ˈvahtnaˌfjœtl̥] ⓘ) is a 40 km (25 mi) long, 9 km (6 mi) wide basaltic fissure vent system that is south-east of Hekla, Iceland. It includes from the north towards the south the hills of Innri-Vatnafjöll at 1,089 m (3,573 ft) high, Fremri-Vatnafjöll at 901 m (2,956 ft) and Vatnafjallarani at 574 m (1,883 ft) as the main Vatnafjöll edifice,[1] at a distance of about 7 km (4.3 mi) from Hekla.[2]: 1151  It is part of the same system as Hekla,[3] and the term Hekla-Vatnafjöll volcanic system has been used to describe it.[4] More than two dozen eruptions have occurred at Vatnafjöll during the Holocene Epoch. Vatnafjöll has not erupted during the last 1100 years.[5]: 4313  While these eruptions were predominantly effusive some basaltic tephra deposits have been found up to 40–50 km (25–31 mi) away.[6]


A Mw5.9 with an epicenter near the main Vatnafjöll edifice occurred on 25th May, 1987,[5]: 4313  where the transform South Iceland seismic zone meets the East volcanic zone of Iceland. Later analysis has suggested that initiation was from strain relief but a subsurface dyke intrusion then occurred over the next 3 days.[2]: 1161 


See also

References

  1. ^ "National Land Survey of Iceland (Kortasja)". Retrieved 3 July 2024.
  2. ^ a b Ágústsson, K.; Linde, A.T.; Stefánsson, R.; Sacks, S. (1999). "Strain changes for the 1987 Vatnafjöll earthquake in south Iceland and possible magmatic triggering". Journal of Geophysical Research: Solid Earth. 104 (B1): 1151–1161. Bibcode:1999JGR...104.1151A. doi:10.1029/1998JB900027.
  3. ^ "Hekla". Global Volcanism Program. Smithsonian Institution. Retrieved 3 July 2024.
  4. ^ "Catalogue of Icelandic Volcanoes:Catalogue of Icelandic Volcanoes:Hekla". Retrieved 3 July 2024.
  5. ^ a b Bjarnason, I.T.; Einarsson, P. (1991). "Source mechanism of the 1987 Vatnafjöll earthquake in South Iceland". Journal of Geophysical Research: Solid Earth. 96 (B3): 4313–4324. Bibcode:1991JGR....96.4313B. doi:10.1029/90JB00831. hdl:20.500.11815/1036.
  6. ^ "Catalogue of Icelandic Volcanoes:Catalogue of Icelandic Volcanoes:Hekla". Retrieved 3 July 2024.: Detailed Description:Eruption history and pattern:Fissure swarm 

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