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Sierra Negra

Negra, Sierra

Gunung api perisai · 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
Tipe
Gunung api perisai
Negara
Ecuador
Wilayah
Eastern Pacific Volcanic Regions / Galapagos Hotspot Volcano Group
Ketinggian
1124 m
Koordinat
-0.830, -91.170
Letusan terakhir
2018
Kondisi tektonik
Rift zone / Oceanic crust (< 15 km)
Bentuk lahan
Shield
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
8250 BCE~7908 BCE · 1 letusan · VEI maks. 01405 BCE~1062 BCE · 1 letusan · VEI maks. 0307~649 · 1 letusan · VEI maks. 0991~1333 · 1 letusan · VEI maks. 01333~1676 · 1 letusan · VEI maks. 01676~2018 · 13 letusan · VEI maks. 38250 BCE5854 BCE3116 BCE720 BCE1676

Garis waktu rinci

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

Tautan eksternal

⚠ Untuk referensi saja. Bukan untuk tanggap darurat.