Earth:Theistareykjarbunga
Theistareykjarbunga (Þeistareykjarbunga, is) is a shield volcano in north-eastern Iceland with two fissure vents called Þeistareykjahraun is and Borgahraun is, and two cones: the 370 m (1,210 ft) Stórahversmór is and the 540 m (1,770 ft), 30 km3 (7.2 cu mi) Stóravíti is. They both are currently extinct,[1] although there is evidence suggesting the potential for activity such as recent localised uplift and seismicity.[2] The multiple vents make up the Theistareykir[1] (Þeistareykir) volcanic system, with more recent evidence that the former classification as a shield volcano is better considered an embryonic central volcano with associated fissure swarm, as rhyolite has erupted in a limited area.[3] The recent lava has picrite, olivine tholeiite basalt characteristics but before the ice age there were basaltic andesite and rhyolite eruptions.[3] There is a central high temperature geothermal area with numerous steam vents and fumaroles.[3] This has been utilised by a 90 MWe power station.[2]
Eruptions
There have been three dated eruptions, all VEI-0: the most recent eruption was around 900 BCE and the previous eruption was in 6800 BCE. Around 9500 BCE, an eruption produced approximately 18 billion cubic metres of basaltic lava.[1]
See also
- Volcanism of Iceland
- List of volcanic eruptions in Iceland
- List of volcanoes in Iceland
References
- ↑ 1.0 1.1 1.2 "Þeistareykir". Smithsonian Institution. https://volcano.si.edu/volcano.cfm?vn=373090.
- ↑ 2.0 2.1 Gudnason, E. Á.; Drouin, V.; Yang, Y.; Sigmundsson, F.; Ágústsdóttir, T.; Mortensen, A.K.. "Changes in seismicity and observed deformation related to inflation at the Theistareykir high-temperature geothermal field, NE Iceland, in 2023-2024". https://meetingorganizer.copernicus.org/EGU24/EGU24-19913.html.
- ↑ 3.0 3.1 3.2 Grönvold, K.; Sæmundsson, K. (2019). "Catalogue of Icelandic Volcanoes:Þeistareykir". Icelandic Meteorological Office, Institute of Earth Sciences at the University of Iceland, Civil Protection Department of the National Commissioner of the Iceland Police. https://icelandicvolcanoes.is/?volcano=TEY.
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