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Cerro Azul

Azul, Cerro

Vulcano a scudo · Ecuador · 1640 m

A large tuff cone occupies the ENE side of the summit caldera of Cerro Azul volcano at the SW tip of Isabela Island. A small caldera bench is seen above the cone at the upper right, and a larger bench on the northern side of the caldera is outlined by the light-colored line below the horizon at the upper left. The 4 x 5 km wide caldera is one of the smallest of the Galápagos shield volcanoes, but its 650 m depth makes it one of the deepest. Youthful dark-colored lava flows at the left cover much of the caldera floor.
A large tuff cone occupies the ENE side of the summit caldera of Cerro Azul volcano at the SW tip of Isabela Island. A small caldera bench is seen above the cone at the upper right, and a larger bench on the northern side of the caldera is outlined by the light-colored line below the horizon at the upper left. The 4 x 5 km wide caldera is one of the smallest of the Galápagos shield volcanoes, but its 650 m depth makes it one of the deepest. Youthful dark-colored lava flows at the left cover much of the caldera floor. · Foto: Photo by Tom Simkin (Smithsonian Institution). · Wikimedia Commons
Tipo
Vulcano a scudo
Paese
Ecuador
Regione
Eastern Pacific Volcanic Regions / Galapagos Hotspot Volcano Group
Altitudine
1640 m
Coordinate
-0.920, -91.408
Ultima eruzione
2008
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

Located at the SW tip of the J-shaped Isabela Island, Cerro Azul contains a steep-walled 4 x 5 km nested summit caldera complex that is one of the smallest diameter, but at 650 m one of the deepest in the Galápagos Islands. The shield volcano is the second highest of the archipelago. A conspicuous bench occupies the SW and west sides of the caldera, which formed during several episodes of collapse. Youthful lava flows cover much of the caldera floor, which has also contained ephemeral lakes. A prominent tuff cone located at the ENE side of the caldera is evidence of episodic hydrovolcanism. Numerous spatter cones dot the western flanks. Fresh-looking lava flows, many erupted from circumferential fissures, descend the NE and NW flanks. Historical eruptions date back only to 1932, but Cerro Azul has been one of the most active Galápagos volcanoes since that time. Solfataric activity continues within the caldera.

Sintesi da Wikipedia

Riassunto in inglese

Cerro Azul is a shield volcano on the south western part of Isabela Island in the Galápagos Islands. At a height of 1,689 m (5,541 ft) it is the second highest peak in the Galapagos and due to its topographic prominence of over 1,500 m (4,921 ft) it is categorised as an ultra. The volcano is one of the most active in the Galapagos, with the last eruption between May and June 2008.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
950 BCE~753 BCE · 1 eruzioni · VEI max. 0556 BCE~358 BCE · 1 eruzioni · VEI max. 01219~1416 · 1 eruzioni · VEI max. 01811~2008 · 12 eruzioni · VEI max. 3950 BCE161 BCE43012191811

Cronologia dettagliata

  1. 2008VEI 1Osservata
    2008-05-29 – 2008-06-17
    Summit and SE flank
  2. 1998VEI 1Osservata
    1998-09-15 – 1998-10-21
    N & W caldera floor, SE flank (630-680 m)
  3. 1979VEI 2Osservata
    1979-01-29 – 1979-03-04
    East flank (300 m) and summit
  4. 1968VEI ?Stima geologica
    1968-06-12 – In corso
    North flank?
  5. 1959VEI 2Osservata
    1959-06-29 – 1959-07-31
    East flank
  6. 1951VEI ?Osservata
    1951-07-02 – In corso
  7. 1949VEI 0Osservata
    1949 – In corso
  8. 1948VEI 0Osservata
    1948-06-30 – In corso
  9. 1943VEI 3Osservata
    1943-04-13 – 1943-05-11
    Caldera ring fracture
  10. 1940VEI 0Osservata
    1940 – In corso
    East flank (Cerro de Las Animas)
  11. 1932VEI 1Osservata
    1932 – In corso
  12. 1850VEI ?Stima geologica
    1850 – In corso
  13. 1250VEI 0Stima geologica
    1250 – In corso
  14. 550 a.C. (±1300 anni)VEI 0Stima geologica
    BCE 550 – In corso
  15. 950 a.C. (±900 anni)VEI 0Stima geologica
    BCE 950 – In corso

Link esterni

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