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Sete Cidades Massif

Sete Cidades

成層火山 · Portugal · 842m

A small peninsula extends into Lagoa Azul ("Blue Lake"), one of two main lakes partially filling the floor of the summit caldera on Sete Cidades volcano at the western end of Sao Miguel Island. The 5-km-wide caldera was formed in three major eruptions at about 36,000, 29,000 and 16,000 years ago, and at least 17 eruptions have occurred here in the last 5,000 years. This view looks to the northwest from the rim of a post-caldera cone containing Lagoa Santiago. Two other post-caldera cones, Caldeira do Alferes and Seara, lie across the lake, behind and to the right of the town of Sete Cidades.
A small peninsula extends into Lagoa Azul ("Blue Lake"), one of two main lakes partially filling the floor of the summit caldera on Sete Cidades volcano at the western end of Sao Miguel Island. The 5-km-wide caldera was formed in three major eruptions at about 36,000, 29,000 and 16,000 years ago, and at least 17 eruptions have occurred here in the last 5,000 years. This view looks to the northwest from the rim of a post-caldera cone containing Lagoa Santiago. Two other post-caldera cones, Caldeira do Alferes and Seara, lie across the lake, behind and to the right of the town of Sete Cidades. · 写真: Photo by R.V. Fisher, 1980 (University of California Santa Barbara). · Wikimedia Commons
タイプ
成層火山
国
Portugal
地域
Atlantic Ocean Volcanic Regions / Azores-Terceira Rift Volcanic Province
標高
842m
座標
37.865, -25.785
最終噴火
1880年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Composite
主要岩石
Trachyte / Trachydacite
地質学的概要

Sete Cidades volcano at the western end of Sao Miguel Island contains a 5-km-wide summit caldera occupied by two caldera lakes. The steep-walled, 500-m-deep caldera was formed about 22,000 years ago, and at least 22 post-caldera eruptions have occurred. A large group of Pleistocene post-caldera trachytic lava domes, lava flows, and pyroclastic-flow deposits is found on the western-to-northern flanks. A nearly circular ring of six Holocene pyroclastic cones on the caldera floor have been the source of a dozen trachytic pumice-fall deposits erupted during the past 5,000 years. Recorded eruptions date back to the 15th century and have occurred both within the caldera and from submarine vents off the west coast.

Wikipedia の要約

英語版の要約

Sete Cidades Massif is a stratovolcanic complex, referring to a polygenetic volcano and caldera, located in western part of the island of São Miguel, in the Portuguese archipelago of the Azores. More recognizable for the Lagoa das Sete Cidades at its centre, the volcanic complex includes centuries of geomorphological structures that include lava domes, cones, lava flows and maar geomorphology that have marked its history.

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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
3050 BCE~2853 BCE · 1件 · 最大 VEI 42064 BCE~1867 BCE · 1件 · 最大 VEI ?881 BCE~684 BCE · 1件 · 最大 VEI ?92 BCE~105 · 1件 · 最大 VEI 4302~500 · 1件 · 最大 VEI 4500~697 · 1件 · 最大 VEI 3894~1091 · 1件 · 最大 VEI 21091~1288 · 1件 · 最大 VEI 21288~1486 · 1件 · 最大 VEI 41486~1683 · 2件 · 最大 VEI 21683~1880 · 5件 · 最大 VEI 33050 BCE1867 BCE684 BCE5001683

詳細タイムライン

  1. 1880年VEI 0地質学的推定
    1880 ~ 進行中
    Volcano Uncertain: submarine vent off Sao Miguel
  2. 1861年VEI 0地質学的推定
    1861 ~ 進行中
    Volcano Uncertain: submarine vent off Sao Miguel
  3. 1811年VEI 2観測記録
    1811-02-01 ~ 1811-02-08
    Submarine vent west of Sete Cidades
  4. 1811年VEI 3観測記録
    1811-06-14 ~ 1811-06-22
    Submarine vent west of Sete Cidades
  5. 1713年VEI 2観測記録
    1713 ~ 進行中
    West flank (Pico das Camarinhas)
  6. 1682年VEI 2観測記録
    1682-12-13 ~ 進行中
    Submarine vent west of Sete Cidades
  7. 1638年VEI 2観測記録
    1638-07-03 ~ 1638-07-28
    Submarine vent west of Sete Cidades
  8. 1444年VEI 4観測記録
    1444 ~ 進行中
    SW side of caldera (Caldeira Seca)
  9. 1110年 (±50年)VEI 2地質学的推定
    1110 ~ 進行中
    West flank (Ponta de Ferraria)
  10. 950年 (±100年)VEI 2地質学的推定
    950 ~ 進行中
    SE flank (Ferraria)
  11. 670年 (±150年)VEI 3地質学的推定
    670 ~ 進行中
    SE flank (Carvao)
  12. 380年 (±300年)VEI 4地質学的推定
    380 ~ 進行中
    SE caldera floor (Lagoa Rasa)
  13. 90年 (±100年)VEI 4地質学的推定
    90 ~ 進行中
    SE caldera floor (Lagoa de Santiago)
  14. 紀元前 750年 (±300年)VEI ?地質学的推定
    BCE 750 ~ 進行中
    SE flank (Eguas)
  15. 紀元前 2050年 (±1000年)VEI ?地質学的推定
    BCE 2050 ~ 進行中
    Caldeira do Alfreres and NW flank
  16. 紀元前 3050年VEI 4地質学的推定
    BCE 3050 ~ 進行中
    Seara Cerrado da Ladeira

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。