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volcano Atacazo

Atacazo

Stratovulcano · Ecuador · 4463 m

Atacazo stratovolcano, located 20 km south of Quito, is seen here from the west along the road to Guayaquil. The volcano contains a summit caldera that is partially filled by lava domes of Holocene age. Lava domes are also found on the SE flank. The only dated Holocene eruption took place about 2400 years ago, forming the Ninahuilca lava domes, the peaks below the center horizon.
Atacazo stratovolcano, located 20 km south of Quito, is seen here from the west along the road to Guayaquil. The volcano contains a summit caldera that is partially filled by lava domes of Holocene age. Lava domes are also found on the SE flank. The only dated Holocene eruption took place about 2400 years ago, forming the Ninahuilca lava domes, the peaks below the center horizon. · Foto: Photo by John Ewert, 1992 (U.S. Geological Survey). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Ecuador
Regione
South America Volcanic Regions / Northern Andean Volcanic Arc
Altitudine
4463 m
Coordinate
-0.353, -78.617
Ultima eruzione
-320
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Atacazo, located about 25 km SW of Quito, consists of a large Pleistocene andesitic stratovolcanoes truncated by a late-Pleistocene to Holocene caldera. Growth of the La Carcacha edifice was followed by construction of Atacazo, a stratovolcano with flank lava domes. The 6-km-wide caldera, which is breached to the SW, is partially filled by three dacitic Holocene lava-dome complexes. Two andesitic lava domes are also found on the SE flank. Several plinian eruptions have occurred at the Atacazo-Ninahuilca complex during the Holocene, accompanied by growth of lava domes. The latest dated eruption took place about 2300 years ago, forming the Ninahuilca Chico lava domes within the summit caldera. Dome formation was accompanied by Plinian explosive eruptions and pyroclastic flows that traveled 35 km down valleys to the west.

Sintesi da Wikipedia

Riassunto in inglese

Atacazo is a volcano of the Western Cordillera located 25 kilometers southwest of Quito, Ecuador. Atacazo is a stratovolcano formed by the action of a Late-Pleistocene to Holocene caldera. The last eruption of the Atacazo was nearly 2300 years ago.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6910 BCE~6690 BCE · 1 eruzioni · VEI max. 43615 BCE~3395 BCE · 1 eruzioni · VEI max. 42517 BCE~2297 BCE · 1 eruzioni · VEI max. 5540 BCE~320 BCE · 1 eruzioni · VEI max. 56910 BCE5372 BCE3615 BCE2077 BCE540 BCE

Cronologia dettagliata

  1. 320 a.C. (±16 anni)VEI 5Stima geologica
    BCE 320 – In corso
    Ninahuilca Chico II dome
  2. 2490 a.C. (±40 anni)VEI 5Stima geologica
    BCE 2490 – In corso
    Ninahuilca Chico I dome
  3. 3490 a.C. (±100 anni)VEI 4Stima geologica
    BCE 3490 – In corso
    Arenal II dome
  4. 6910 a.C.VEI 4Stima geologica
    BCE 6910 – In corso
    La Cocha II dome

Link esterni

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