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Sierra Negra

Negra, Sierra

Volcán en escudo · Ecuador · 1124 m

An aerial view of the SW caldera floor of Sierra Negra volcano shows El Azufre fumarolic field and the trap-door fault to the left. This sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. El Azufre, the largest fumarolic area in the Galápagos Islands, lies within a graben between this ridge and the west caldera wall. The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands.
An aerial view of the SW caldera floor of Sierra Negra volcano shows El Azufre fumarolic field and the trap-door fault to the left. This sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. El Azufre, the largest fumarolic area in the Galápagos Islands, lies within a graben between this ridge and the west caldera wall. The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands. · Foto: Photo by Patricio Ramon, 2005 (Instituto Geofisca, Escuela Politecnica Nacional). · Wikimedia Commons
Tipo
Volcán en escudo
País
Ecuador
Región
Pacífico Oriental / Galapagos Hotspot Volcano Group
Altitud
1124 m
Coordenadas
-0.830, -91.170
Última erupción
2018
Contexto tectónico
Rift zone / Oceanic crust (< 15 km)
Forma volcánica
Shield
Roca principal
Basalt / Picro-Basalt
Resumen geológico

The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands. Flank vents abound, including cinder cones and spatter cones concentrated along an ENE-trending rift system and tuff cones along the coast and forming offshore islands. Although it is the largest of the five major Isabela volcanoes, it has the flattest slopes, averaging less than 5° and diminishing to 2° near the coast. A sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. The Volcán de Azufre fumarolic area lies within a graben between this ridge and the west caldera wall. Lava flows from a major eruption in 1979 extend all the way to the north coast from circumferential fissure vents on the upper northern flank.

Resumen de Wikipedia

Resumen en inglés

Sierra Negra is a large shield volcano at the southeastern end of Isabela Island in the Galapagos that rises to an altitude of 1124m. It coalesces with the volcanoes Cerro Azul to the west and Alcedo to the north. It is one of the most active of the Galapagos volcanoes with the most recent historic eruption beginning in June 2018 and continuing through the summer.

Wikipedia · CC BY-SA · Leer artículo completo →

Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
8250 BCE~7908 BCE · 1 erupciones · VEI máx. 01405 BCE~1062 BCE · 1 erupciones · VEI máx. 0307~649 · 1 erupciones · VEI máx. 0991~1333 · 1 erupciones · VEI máx. 01333~1676 · 1 erupciones · VEI máx. 01676~2018 · 13 erupciones · VEI máx. 38250 BCE5854 BCE3116 BCE720 BCE1676

Línea de tiempo detallada

  1. 2018VEI 2Observado
    2018-06-26 – 2018-08-23
    Summit crater and NNW flank, Volcan Chico fissure vent
  2. 2005VEI 3Observado
    2005-10-22 – 2005-10-30
    North caldera rim
  3. 1979VEI 3Observado
    1979-11-13 – 1980-01-14
    Upper NW and NE flanks (Volcán Chico)
  4. 1963VEI 2Observado
    1963-04-13 – 1963-05-16
    Volcán Chico area & NW caldera rim
  5. 1957VEI ?Estimación geológica
    1957-07-02 – En curso
    Volcano Uncertain: Isabela Island
  6. 1954VEI 2Estimación geológica
    1954-11-09 – En curso
    Volcano Uncertain: originally Alcedo
  7. 1953VEI 3Observado
    1953-08-27 – 1954-01-16
    Volcán Chico area & NW caldera rim
  8. 1948VEI 2Observado
    1948-08-16 – 1949-02-16
  9. 1911VEI ?Observado
    1911-12-31 – En curso
  10. 1860VEI 2Estimación geológica
    1860-07-02 – En curso
    Volcano Uncertain: Isabela Island
  11. 1844VEI 0Estimación geológica
    1844-07-02 – En curso
    Volcano Uncertain: Isabela Island
  12. 1817VEI ?Estimación geológica
    1817-07-02 – En curso
    Volcano Uncertain: Isabela Island
  13. 1813VEI 2Estimación geológica
    1813-07-13 – En curso
    Volcano Uncertain: South end of Isabela Island
  14. 1350 (±500 años)VEI 0Estimación geológica
    1350 – En curso
  15. 1060 (±500 años)VEI 0Estimación geológica
    1060 – En curso
  16. 370 (±1100 años)VEI 0Estimación geológica
    370 – En curso
  17. 1250 a. C. (±100 años)VEI 0Estimación geológica
    BCE 1250 – En curso
    SE flank
  18. 8250 a. C. (±1600 años)VEI 0Estimación geológica
    BCE 8250 – En curso

Enlaces externos

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