Ecuador · Vulcano a scudo
Sierra Negra
Negra, Sierra
- Tipo
- Vulcano a scudo
- Altitudine
- 1124 m
- Ultima eruzione
- 2018
- Tipo
- Vulcano a scudo
- Paese
- Ecuador
- Regione
- Pacifico orientale / Galapagos Hotspot Volcano Group
- Altitudine
- 1124 m
- Coordinate
- -0.830, -91.170
- Ultima eruzione
- 2018
- Contesto tettonico
- Zona di rift / Crosta oceanica (< 15 km)
- Forma vulcanica
- A scudo
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
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.
Sintesi da Wikipedia
Riassunto in ingleseSierra 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.
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Storia delle eruzioni
18 registrateGlossarioCronologia dettagliata
- 2018VEI 2Osservata2018-06-26 – 2018-08-23Summit crater and NNW flank, Volcan Chico fissure vent
- 2005VEI 3Osservata2005-10-22 – 2005-10-30North caldera rim
- 1979VEI 3Osservata1979-11-13 – 1980-01-14Upper NW and NE flanks (Volcán Chico)
- 1963VEI 2Osservata1963-04-13 – 1963-05-16Volcán Chico area & NW caldera rim
- 1957VEI ?Metodo non indicato1957-07-02 – fine sconosciutaVolcano Uncertain: Isabela Island
- 1954VEI 2Metodo non indicato1954-11-09 – fine sconosciutaVolcano Uncertain: originally Alcedo
- 1953VEI 3Osservata1953-08-27 – 1954-01-16Volcán Chico area & NW caldera rim
- 1948VEI 2Osservata1948-08-16 – 1949-02-16
- 1911VEI ?Osservata1911-12-31 – fine sconosciuta
- 1860VEI 2Metodo non indicato1860-07-02 – fine sconosciutaVolcano Uncertain: Isabela Island
- 1844VEI 0Metodo non indicato1844-07-02 – fine sconosciutaVolcano Uncertain: Isabela Island
- 1817VEI ?Metodo non indicato1817-07-02 – fine sconosciutaVolcano Uncertain: Isabela Island
- 1813VEI 2Metodo non indicato1813-07-13 – fine sconosciutaVolcano Uncertain: South end of Isabela Island
- 1350 (±500 anni)VEI 0Stima geologica1350 – fine sconosciuta
- 1060 (±500 anni)VEI 0Stima geologica1060 – fine sconosciuta
- 370 (±1100 anni)VEI 0Stima geologica370 – fine sconosciuta
- 1250 a.C. (±100 anni)VEI 0Stima geologica1250 a.C. – fine sconosciutaSE flank
- 8250 a.C. (±1600 anni)VEI 0Stima geologica8250 a.C. – fine sconosciuta
Vulcani nelle vicinanze
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⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.