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Þeistareykjabunga

Theistareykir

Vulcano a scudo · Iceland · 563 m

Stóravíti crater, seen here from the SE, is 600 m across and 140 m deep. It is located in the summit area of the Holocene Theistareykjarbunga shield volcano, part of the northernmost subaerial volcanic system along the Eastern Volcanic Zone of Iceland. The youngest dated eruption in this system produced the Theistareykjahraun lava flow about 2,400 years ago.
Stóravíti crater, seen here from the SE, is 600 m across and 140 m deep. It is located in the summit area of the Holocene Theistareykjarbunga shield volcano, part of the northernmost subaerial volcanic system along the Eastern Volcanic Zone of Iceland. The youngest dated eruption in this system produced the Theistareykjahraun lava flow about 2,400 years ago. · Foto: Photo by Michael Ryan, 1984 (U.S. Geological Survey).
Tipo
Vulcano a scudo
Paese
Iceland
Regione
Oceano Atlantico / Iceland Neovolcanic Rift Volcanic Province
Altitudine
563 m
Coordinate
65.883, -16.967
Ultima eruzione
-900
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The Holocene Theistareykir fissure system, including the basaltic Theistareykjarbunga shield volcano, extends from north of Myvatn lake to the coast of Iceland. This is the northernmost subaerial volcanic system along the Eastern Volcanic Zone of Iceland. The 30 km3 Theistareykjarbunga shield volcano formed slightly after deglaciation; the youngest dated eruption produced the Theistareykjahraun lava flow about 2,400 years ago.

Sintesi da Wikipedia

Riassunto in inglese

Theistareykjarbunga is a shield volcano in north-eastern Iceland with two fissure vents called Þeistareykjahraun and Borgahraun, and two cones: the 370 m (1,210 ft) Stórahversmór and the 540 m (1,770 ft), 30 km3 (7.2 cu mi) Stóravíti. They both are currently extinct, although there is evidence suggesting the potential for activity such as recent localised uplift and seismicity. The multiple vents make up the Theistareykir (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. The recent lava has picrite, olivine tholeiite basalt characteristics but before the ice age there were basaltic andesite and rhyolite eruptions. There is a central high temperature geothermal area with numerous steam vents and fumaroles. This has been utilised by a 90 MWe power station.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
9500 BCE~9213 BCE · 1 eruzioni · VEI max. 06920 BCE~6633 BCE · 1 eruzioni · VEI max. 01187 BCE~900 BCE · 1 eruzioni · VEI max. 09500 BCE7493 BCE5200 BCE3193 BCE1187 BCE

Cronologia dettagliata

  1. 900 a.C. (±100 anni)VEI 0Stima geologica
    BCE 900 – In corso
    Storihver (Theistareykjahraun)
  2. 6800 a.C.VEI 0Stima geologica
    BCE 6800 – In corso
    Borgarhraun and other flows
  3. 9500 a.C.VEI 0Stima geologica
    BCE 9500 – In corso
    Theistareykjabunga shield volcano

Link esterni

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