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volcano Atacazo

Atacazo

Stratovolkan · 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
Tipe
Stratovolkan
Negara
Ecuador
Wilayah
South America Volcanic Regions / Northern Andean Volcanic Arc
Ketinggian
4463 m
Koordinat
-0.353, -78.617
Letusan terakhir
-320
Kondisi tektonik
Subduction zone / Continental crust (> 25 km)
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
6910 BCE~6690 BCE · 1 letusan · VEI maks. 43615 BCE~3395 BCE · 1 letusan · VEI maks. 42517 BCE~2297 BCE · 1 letusan · VEI maks. 5540 BCE~320 BCE · 1 letusan · VEI maks. 56910 BCE5372 BCE3615 BCE2077 BCE540 BCE

Garis waktu rinci

  1. 320 SM (±16 tahun)VEI 5Perkiraan geologi
    BCE 320 – Berlangsung
    Ninahuilca Chico II dome
  2. 2490 SM (±40 tahun)VEI 5Perkiraan geologi
    BCE 2490 – Berlangsung
    Ninahuilca Chico I dome
  3. 3490 SM (±100 tahun)VEI 4Perkiraan geologi
    BCE 3490 – Berlangsung
    Arenal II dome
  4. 6910 SMVEI 4Perkiraan geologi
    BCE 6910 – Berlangsung
    La Cocha II dome

Tautan eksternal

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