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Novarupta

Caldera · United States · 841 m

A lava dome 65 m high and 380 m wide lies within a circular ejecta ring and caps the 1912 vent of Novarupta volcano. A 60-hour-long eruption that began on 6 June 1912 was the largest eruption during the 20th century, producing The Valley of Ten Thousand Smokes pyroclastic flow deposit which forms the flat ground to the right. The face of Falling Mountain, behind Novarupta dome, was sheared off by a 2-km-wide collapse around the vent. This view from the NE shows snow-capped Mageik in the background.
A lava dome 65 m high and 380 m wide lies within a circular ejecta ring and caps the 1912 vent of Novarupta volcano. A 60-hour-long eruption that began on 6 June 1912 was the largest eruption during the 20th century, producing The Valley of Ten Thousand Smokes pyroclastic flow deposit which forms the flat ground to the right. The face of Falling Mountain, behind Novarupta dome, was sheared off by a 2-km-wide collapse around the vent. This view from the NE shows snow-capped Mageik in the background. · Foto: Photo by Tom Miller (Alaska Volcano Observatory, U.S. Geological Survey). · Wikimedia Commons
Tipo
Caldera
Paese
United States
Regione
Nord America / Alaska Peninsula Volcanic Arc
Altitudine
841 m
Coordinate
58.266, -155.159
Ultima eruzione
1912
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Caldera
Roccia principale
Rhyolite
Sintesi geologica

Novarupta, the least topographically prominent volcano in the Katmai area, was formed during a major eruption in 1912. This eruption was the world's largest during the 20th century and produced a voluminous rhyolitic airfall tephra and the renowned Valley of Ten Thousand Smokes (VTTS) ash flow. At the end of the eruption a small, 65-m-high, 400-m-wide lava dome grew within the source vent of the VTTS ashflow, a 2-km-wide area of subsidence NW of Trident volcano. The NE side of the Falling Mountain lava dome of the Trident volcanic cluster, as well as Broken Mountain and Baked Mountain, was removed by collapse of the Novarupta depression, which is marked by radial and scalloped arcuate fractures. Much larger collapse took place at Katmai volcano, 10 km E, where a 3 x 4 km caldera formed in response to magma reservoir drainage toward Novarupta.

Sintesi da Wikipedia

Novarupta, che significa "nuova eruzione", è un vulcano situato sulla penisola di Alaska nella regione del Monte Katmai, a circa 470 km a sud-ovest di Anchorage. Formatosi nel 1912 durante una delle più grandi eruzioni vulcaniche del XX secolo, dal Novarupta fuoriuscì un volume di magma pari a 30 volte quello rilasciato nell'eruzione vulcanica del Monte Sant'Elena.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
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1912~1912 · 1 eruzioni · VEI max. 619121912191319131913

Cronologia dettagliata

  1. 1912VEI 6Osservata
    1912-06-06 – 1912-10-16

Link esterni

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