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.[3][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.[3] To the north-east are multiple tindars,[3] 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).[4][3] The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite.[3]
| Hrómundartindur | |
|---|---|
| Highest point | |
| Elevation | 540 metres (1,770 ft)[1] |
| Coordinates | 64°04′N 21°13′W / 64.067°N 21.217°W |
| Geology | |
| Mountain type | central volcano |
| Last eruption | 3500 BCE |
 Selected geological features near the Hrómundartindur volcanic system (red outline) and its Holocene lava flows (violet shading). Other shading shows: calderas, central volcanoes and fissure swarms, subglacial terrain above 1,100 m (3,600 ft), and seismically active areas. Clicking on the image enlarges to full window and enables mouse-over with more detail.[2] | |
Activity edit
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.[5]
See also edit
References edit
- ^ a b c "Hrómundartindur". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.
- ^ Óskarsson, Birgir V.; Riishuus, M.S; Erlendsson, Ögmundur; Askew, Robert A.; Hjartarson, Árni; Sigurgeirsson, Magnús Á.; Brynjólfsson, Skafti; Jakobsson, Sveinn P. (2022). "Jarðfræði af jarðfræðikortum ÍSOR (1:100.000 Geology Maps of Iceland series)". www.ni.is (in Icelandic). Iceland: ÍSOR, Icelandic Institute of Natural History. Retrieved 4 May 2024.
- ^ a b c d e Sæmundsson, Kristján (2019). "Catalogue of Icelandic Volcanoes:Hrómundartindur". Retrieved 5 May 2024.
- ^ 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
- ^ 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.
External links edit
- Hrómundartindur Archived 2017-02-04 at the Wayback Machine in the Catalogue of Icelandic Volcanoes