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Sete Cidades Massif

Sete Cidades

Stratovolkan · Portugal · 842 m

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. · Foto: Photo by R.V. Fisher, 1980 (University of California Santa Barbara). · Wikimedia Commons
Tipe
Stratovolkan
Negara
Portugal
Wilayah
Atlantic Ocean Volcanic Regions / Azores-Terceira Rift Volcanic Province
Ketinggian
842 m
Koordinat
37.865, -25.785
Letusan terakhir
1880
Kondisi tektonik
Rift zone / Oceanic crust (< 15 km)
Bentuk lahan
Composite
Batuan utama
Trachyte / Trachydacite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
3050 BCE~2853 BCE · 1 letusan · VEI maks. 42064 BCE~1867 BCE · 1 letusan · VEI maks. ?881 BCE~684 BCE · 1 letusan · VEI maks. ?92 BCE~105 · 1 letusan · VEI maks. 4302~500 · 1 letusan · VEI maks. 4500~697 · 1 letusan · VEI maks. 3894~1091 · 1 letusan · VEI maks. 21091~1288 · 1 letusan · VEI maks. 21288~1486 · 1 letusan · VEI maks. 41486~1683 · 2 letusan · VEI maks. 21683~1880 · 5 letusan · VEI maks. 33050 BCE1867 BCE684 BCE5001683

Garis waktu rinci

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

Tautan eksternal

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