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Bulletin Volcanologique

, Volume 46, Issue 4, pp 349–363 | Cite as

The Hekla eruption 1980–1981

  • K. Gronvold
  • G. Larsen
  • P. Einarsson
  • S. Thorarinsson
  • K. Saemundsson
Article

Abstract

The sixteenth eruption of Hekla since 1104 began on August 17th, 1980, after the shortest repose period on record, only ten years. The eruption started with a plinian phase and simultaneously lava issued at high rate from a fissure that runs along the Hekla volcanic ridge. The production rate declined rapidly after the first day and the eruption stopped on August 20th. A total of 120 million m3 of lava and about 60 million m3 of airborne tephra were produced during this phase of the activity. In the following seven months steam emissions were observed on the volcano. Activity was renewed on April 9th 1981, and during the following week additional 30 million m3 of lava flowed from a summit crater and crater rows on the north slope.

The lavas and tephra are of uniform intermediate chemical composition similar to that of earlier Hekla lavas. Although the repose time was short the eruptions fit well into the behaviour pattern of earlier eruptions. Distance changes in a geodimeter network established after the eruptions are interpreted as due to inflation of magma reservoirs at 7–8 kilometers depth.

Keywords

Tephra Lava Flow Magma Reservoir Summit Crater Volcanic Tremor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Intern. Association of Volcanology and Chemistry of the Earth’s Interior 1983

Authors and Affiliations

  • K. Gronvold
    • 1
  • G. Larsen
    • 1
  • P. Einarsson
    • 2
  • S. Thorarinsson
    • 2
  • K. Saemundsson
    • 3
  1. 1.Nordic Volcanological InstituteUniversity of IcelandReykjavik
  2. 2.Science InstituteUniversity of IcelandReykjavik
  3. 3.National Energy AuthorityReykjavik

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