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Heidarspordar

割れ目火口 · Iceland · 490m

The Laxarhraun lava field in the Heiðarspordar volcanic system covered much of the Lake Mývatn area and lava flowed down the Laxardalur canyon to the north coast. Numerous pseudocraters and rootless cones, some of which are seen here along the shore of the lake, formed as a result of secondary explosive activity when the lava flow encountered abundant groundwater. The massive 224 km2 flow, erupted about 2,000 years ago, forms all but the northern shoreline of the lake.
The Laxarhraun lava field in the Heiðarspordar volcanic system covered much of the Lake Mývatn area and lava flowed down the Laxardalur canyon to the north coast. Numerous pseudocraters and rootless cones, some of which are seen here along the shore of the lake, formed as a result of secondary explosive activity when the lava flow encountered abundant groundwater. The massive 224 km2 flow, erupted about 2,000 years ago, forms all but the northern shoreline of the lake. · 写真: Photo by Michael Ryan, 1984 (U.S. Geological Survey).
タイプ
割れ目火口
国
Iceland
地域
Atlantic Ocean Volcanic Regions / Iceland Neovolcanic Rift Volcanic Province
標高
490m
座標
65.583, -16.817
最終噴火
-300年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Cluster
地質学的概要

The Heiðarsporðar volcanic system in the Northern Volcanic Zone is about 22 km long, consisting of a fissure swarm and a central volcano. It is embryonic, starting to develop in the marginal area of two adjacent fissure areas, Krafla and Fremrinámar, producing large-volume eruptions. No geothermal activity is present. Magma composition ranges from olivine-tholeiite through tholeiitic basalt and basaltic andesite to dacite. Characteristic activity consists of effusive basaltic eruptions and small predominantly effusive silicic eruptions. It has shown rather low activity in the Holocene but has produced substantial basaltic lava flows. Two eruptive periods have occurred in Holocene time separated by over 8,000 years. The last eruption took place about 2,200 years ago, producing a lava flow covering about 220 km2 and extending 60 km from source.

Wikipedia の要約

英語版の要約

The Heiðarsporðar volcanic system is located in northeast Iceland near Lake Mývatn. It is the source of numerous formations present in and around the lake, particularly in the form of pseudocraters.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
7850 BCE~7598 BCE · 1件 · 最大 VEI ?7598 BCE~7347 BCE · 1件 · 最大 VEI 07095 BCE~6843 BCE · 1件 · 最大 VEI 06340 BCE~6088 BCE · 1件 · 最大 VEI 05837 BCE~5585 BCE · 1件 · 最大 VEI 04075 BCE~3823 BCE · 1件 · 最大 VEI 0552 BCE~300 BCE · 1件 · 最大 VEI 27850 BCE6088 BCE4075 BCE2313 BCE552 BCE

詳細タイムライン

  1. 紀元前 300年VEI 2地質学的推定
    BCE 300 ~ 進行中
    Threngslaborgir-Ludentsborgir crater row
  2. 紀元前 4050年VEI 0地質学的推定
    BCE 4050 ~ 進行中
    Ludent crater rows
  3. 紀元前 5750年VEI 0地質学的推定
    BCE 5750 ~ 進行中
    Fjarborg
  4. 紀元前 6150年VEI 0地質学的推定
    BCE 6150 ~ 進行中
    Drangagrundahraun
  5. 紀元前 6950年VEI 0地質学的推定
    BCE 6950 ~ 進行中
    Hraunbunga
  6. 紀元前 7400年 (±300年)VEI 0地質学的推定
    BCE 7400 ~ 進行中
    Heidarspordur
  7. 紀元前 7850年VEI ?地質学的推定
    BCE 7850 ~ 進行中
    Ludent, Namafjall-Krofluhals

外部リンク

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