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Monte Rainier

Rainier

Stratovulcano · United States · 4392 m

Mount Rainier is located east of the Puget Sound region, seen here from High Knob to the SW in 1981. Large Holocene mudflows from this heavily glaciated volcano have reached as far as the Puget Sound lowlands. Several postglacial tephras have erupted from Rainier, with tree-ring dating placing the last recognizable tephra deposit during the 19th century. Extensive hydrothermal alteration of the upper portion of the volcano has contributed to its structural weakness.
Mount Rainier is located east of the Puget Sound region, seen here from High Knob to the SW in 1981. Large Holocene mudflows from this heavily glaciated volcano have reached as far as the Puget Sound lowlands. Several postglacial tephras have erupted from Rainier, with tree-ring dating placing the last recognizable tephra deposit during the 19th century. Extensive hydrothermal alteration of the upper portion of the volcano has contributed to its structural weakness. · Foto: Photo by Lee Siebert, 1981 (Smithsonian Institution). · Wikimedia Commons
Tipo
Stratovulcano
Paese
United States
Regione
North America Volcanic Regions / High Cascades Volcanic Arc
Altitudine
4392 m
Coordinate
46.853, -121.760
Ultima eruzione
1450
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Mount Rainier is a heavily glaciated andesitic volcano in the Puget Sound region. Large Holocene mudflows from collapse have reached as far as the Puget Sound lowlands. The present summit was constructed within a large crater breached to the NE, formed by collapse during a major explosive eruption about 5,600 years ago that deposited the widespread Osceola Mudflow. Rainier has produced eruptions throughout the Holocene, including about a dozen during the past 2,600 years; the largest of these occurred about 2,200 years ago. The present summit cone is capped by two overlapping craters. Extensive hydrothermal alteration of the upper portion of the volcano has contributed to its structural weakness; an active thermal system has caused periodic melting on flank glaciers and produced an elaborate system of steam caves in the summit icecap. Reported uncertain 19th-century eruptions, including a possible but not confirmed phreatic eruption in 1894, have not left identifiable deposits.

Sintesi da Wikipedia

Riassunto in inglese

Mount Rainier, also known as Tahoma, is a large, active stratovolcano in the Cascade Range of the Pacific Northwest in the United States. The mountain is located in Mount Rainier National Park about 59 miles (95 km) south-southeast of Seattle. At 14,410 feet (4,390 m) it is the highest mountain in the U.S. state of Washington, the most topographically prominent mountain in the contiguous United States, and the tallest in the Cascade Volcanic Arc.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
8050 BCE~7719 BCE · 2 eruzioni · VEI max. 35730 BCE~5398 BCE · 1 eruzioni · VEI max. 25398 BCE~5067 BCE · 1 eruzioni · VEI max. 35067 BCE~4735 BCE · 2 eruzioni · VEI max. 34072 BCE~3741 BCE · 1 eruzioni · VEI max. ?3741 BCE~3409 BCE · 1 eruzioni · VEI max. 33078 BCE~2747 BCE · 1 eruzioni · VEI max. 22747 BCE~2415 BCE · 1 eruzioni · VEI max. 3758 BCE~426 BCE · 4 eruzioni · VEI max. ?426 BCE~95 BCE · 3 eruzioni · VEI max. 4237~568 · 1 eruzioni · VEI max. ?900~1231 · 1 eruzioni · VEI max. ?1231~1563 · 1 eruzioni · VEI max. ?1563~1894 · 7 eruzioni · VEI max. 28050 BCE5730 BCE3078 BCE758 BCE1563

Cronologia dettagliata

  1. 1894VEI 1Osservata
    1894-11-21 – 1894-12-24
  2. 1882VEI 2Stima geologica
    1882 – In corso
  3. 1879VEI 2Stima geologica
    1879 – In corso
  4. 1870VEI 2Stima geologica
    1870 – In corso
  5. 1858VEI 2Stima geologica
    1858 – In corso
  6. 1854VEI 2Stima geologica
    1854 – In corso
  7. 1843VEI 2Stima geologica
    1843 – In corso
  8. 1450 (±100 anni)VEI ?Stima geologica
    1450 – In corso
  9. 910 (±500 anni)VEI ?Stima geologica
    910 – In corso
  10. 440 (±100 anni)VEI ?Stima geologica
    440 – In corso
  11. 150 a.C.VEI ?Stima geologica
    BCE 150 – In corso
  12. 250 a.C. (±200 anni)VEI 4Stima geologica
    BCE 250 – In corso
  13. 400 a.C. (±50 anni)VEI ?Stima geologica
    BCE 400 – In corso
  14. 500 a.C. (±50 anni)VEI ?Stima geologica
    BCE 500 – In corso
  15. 610 a.C. (±100 anni)VEI ?Stima geologica
    BCE 610 – In corso
  16. 650 a.C. (±50 anni)VEI ?Stima geologica
    BCE 650 – In corso
  17. 700 a.C. (±50 anni)VEI ?Stima geologica
    BCE 700 – In corso
  18. 2550 a.C.VEI 3Stima geologica
    BCE 2550 – In corso
  19. 2750 a.C.VEI 2Stima geologica
    BCE 2750 – In corso
  20. 3650 a.C.VEI 3Stima geologica
    BCE 3650 – In corso
  21. 3850 a.C. (±200 anni)VEI ?Stima geologica
    BCE 3850 – In corso
  22. 4850 a.C.VEI 2Stima geologica
    BCE 4850 – In corso
  23. 5050 a.C.VEI 3Stima geologica
    BCE 5050 – In corso
  24. 5350 a.C.VEI 3Stima geologica
    BCE 5350 – In corso
  25. 5550 a.C.VEI 2Stima geologica
    BCE 5550 – In corso
  26. 7800 a.C. (±300 anni)VEI ?Stima geologica
    BCE 7800 – In corso
  27. 8050 a.C.VEI 3Stima geologica
    BCE 8050 – In corso

Link esterni

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