Hrómundartindur

Hrómundartindur (Icelandic pronunciation: [ˈr̥ouːˌmʏntarˌtʰɪntʏr̥] ) is a mountain in Iceland north of Hveragerði with an elevation of 540 metres (1,770 ft).[1] It to the east of Hengill and is the central volcano of an adjacent 25 km (16 mi) long Hrómundartindur volcanic system, which contains the Ölkeduháls geothermal field.[2][1] Like Hengill this area is close to the south-eastern triple junction of the Hreppar microplate, is seismically active, and associated with the Western volcanic zone and the South Iceland seismic zone.[2] To the north-east are multiple tindars,[2] and there is a Holocene lava flow called Tjarnahnúkshraun which covers 4 km2 (1.5 sq mi) with a volume of 0.03 km3 (0.0072 cu mi).[3][2] The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite.[2]

Hrómundartindur
Highest point
Elevation540 metres (1,770 ft)[1]
Coordinates64°04′N 21°13′W
Geology
Mountain typecentral volcano
Last eruption3500 BCE

Activity

During 2017 and 2018 GPS and seismic studies were consistent with either hydrothermal fluid or magma increase at a depth of approximately 5–7 km (3.1–4.3 mi) within the inferred brittle-ductile transition zone of the area centred at Ölkelduháls, between Hengill and Hrómundartindur. This volume had had been contracting between 2006–2017, and was about 3 km (1.9 mi) north-west from an area of uplift between 1993 and 1999.[4]

See also

References
  1. "Hrómundartindur". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.
  2. Sæmundsson, Kristján (2019). "Catalogue of Icelandic Volcanoes:Hrómundartindur". Retrieved 5 May 2024.
  3. Sinton, J.; Grönvold, K.; Sæmundsson, K. (2005). "Postglacial eruptive history of the western volcanic zone, Iceland". Geochemistry, Geophysics, Geosystems. 6 (12). Bibcode:2005GGG.....612009S. doi:10.1029/2005GC001021. ISSN 1525-2027.: Fig. 4 
  4. Ducrocq, C.; Geirsson, H.; Árnadóttir, T.; Juncu, D.; Drouin, V.; Gunnarsson, G.; Kristjansson, B.R.; Sigmundsson, F.; Hreinsdottir, S.; Tómasdóttir, S.; Blanck, H. (2021). "Inflation-deflation episodes in the Hengill and Hrómundartindur volcanic complexes, SW Iceland". Frontiers in Earth Science. 9: 725109. Bibcode:2021FrEaS...9..915D. doi:10.3389/feart.2021.725109.


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