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Mount Spurr

Spurr

Stratovulcano · United States · 3374 m

During the late Pleistocene or early Holocene Mount Spurr underwent flank collapse, resulting in the 5-6 km crater that opens to the south shown here in 1993. The collapse produced a debris avalanche that traveled at least 25 km from the summit. The snow-covered peak (center) is a post-collapse lava dome. Crater Peak, in front of it, has been the source of frequent Holocene eruptions.
During the late Pleistocene or early Holocene Mount Spurr underwent flank collapse, resulting in the 5-6 km crater that opens to the south shown here in 1993. The collapse produced a debris avalanche that traveled at least 25 km from the summit. The snow-covered peak (center) is a post-collapse lava dome. Crater Peak, in front of it, has been the source of frequent Holocene eruptions. · Foto: Photo by Christina Neal, 1993 (U.S. Geological Survey, Alaska Volcano Observatory). · Wikimedia Commons
Tipo
Stratovulcano
Paese
United States
Regione
North America Volcanic Regions / Alaska Peninsula Volcanic Arc
Altitudine
3374 m
Coordinate
61.299, -152.251
Ultima eruzione
1992
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Mount Spurr is the closest volcano to Anchorage, Alaska (130 km W) and just NE of Chakachamna Lake. The summit is a large lava dome at the center of a roughly 5-km-wide amphitheater open to the south formed by a late-Pleistocene or early Holocene debris avalanche and associated pyroclastic flows that destroyed an older edifice. The debris avalanche traveled more than 25 km SE, and the resulting deposit contains blocks as large as 100 m in diameter. Several ice-carved post-collapse cones or lava domes are present. The youngest vent, Crater Peak, formed at the southern end of the amphitheater and has been the source of about 40 identified Holocene tephra layers. Eruptions from Crater Peak in 1953 and 1992 deposited ash in Anchorage.

Sintesi da Wikipedia

Riassunto in inglese

Mount Spurr (Dena'ina: K'idazq'eni) is a stratovolcano in the Aleutian Arc of Alaska, named after United States Geological Survey geologist and explorer Josiah Edward Spurr, who led an expedition to the area in 1898. The Alaska Volcano Observatory (AVO) rates Mount Spurr as Level of Concern Color Code Yellow. The mountain is known aboriginally by the Dena'ina Athabascan name K'idazq'eni, literally 'that which is burning inside'.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6050 BCE~5782 BCE · 1 eruzioni · VEI max. ?5246 BCE~4978 BCE · 1 eruzioni · VEI max. ?4174 BCE~3905 BCE · 1 eruzioni · VEI max. ?3369 BCE~3101 BCE · 1 eruzioni · VEI max. ?1456~1724 · 1 eruzioni · VEI max. ?1724~1992 · 2 eruzioni · VEI max. 46050 BCE4174 BCE2029 BCE153 BCE1724

Cronologia dettagliata

  1. 1992VEI 4Osservata
    1992-06-27 – 1992-09-17
    South flank (Crater Peak)
  2. 1953VEI 4Osservata
    1953-07-09 – 1953-07-16
    South flank (Crater Peak)
  3. 1650 (±50 anni)VEI ?Stima geologica
    1650 – In corso
    South flank (Crater Peak)
  4. 3250 a.C.VEI ?Stima geologica
    BCE 3250 – In corso
    Mt. Spurr central lava/cone complex
  5. 4050 a.C.VEI ?Stima geologica
    BCE 4050 – In corso
    South flank (Crater Peak)
  6. 5110 a.C. (±100 anni)VEI ?Stima geologica
    BCE 5110 – In corso
    Mt. Spurr central dome/cone complex
  7. 6050 a.C.VEI ?Stima geologica
    BCE 6050 – In corso
    Mt. Spurr central dome/cone complex

Link esterni

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