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Sete Cidades Massif

Sete Cidades

Estratovolcán · 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
Tipo
Estratovolcán
País
Portugal
Región
Atlantic Ocean Volcanic Regions / Azores-Terceira Rift Volcanic Province
Altitud
842 m
Coordenadas
37.865, -25.785
Última erupción
1880
Contexto tectónico
Rift zone / Oceanic crust (< 15 km)
Forma volcánica
Composite
Roca principal
Trachyte / Trachydacite
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

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.

Wikipedia · CC BY-SA · Leer artículo completo →

Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
3050 BCE~2853 BCE · 1 erupciones · VEI máx. 42064 BCE~1867 BCE · 1 erupciones · VEI máx. ?881 BCE~684 BCE · 1 erupciones · VEI máx. ?92 BCE~105 · 1 erupciones · VEI máx. 4302~500 · 1 erupciones · VEI máx. 4500~697 · 1 erupciones · VEI máx. 3894~1091 · 1 erupciones · VEI máx. 21091~1288 · 1 erupciones · VEI máx. 21288~1486 · 1 erupciones · VEI máx. 41486~1683 · 2 erupciones · VEI máx. 21683~1880 · 5 erupciones · VEI máx. 33050 BCE1867 BCE684 BCE5001683

Línea de tiempo detallada

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

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.