Stati Uniti · Vulcano a scudo
Vulcano Newberry
Newberry
- Tipo
- Vulcano a scudo
- Altitudine
- 2434 m
- Ultima eruzione
- 690
- Tipo
- Vulcano a scudo
- Paese
- Stati Uniti
- Regione
- Nord America / High Cascades Volcanic Arc
- Altitudine
- 2434 m
- Coordinate
- 43.722, -121.229
- Ultima eruzione
- 690
- Contesto tettonico
- Zona di subduzione / Crosta continentale (> 25 km)
- Forma vulcanica
- A scudo
- Roccia principale
- Andesite / Andesite basaltica
Sintesi geologica
Newberry volcano, situated east of the Cascade Range, covers an area of about 1,600 km2. The low-angle basaltic to basaltic andesite shield volcano includes more than 400 cinder cones, but has also produced major silicic eruptions associated with formation of a 6 x 8 km summit caldera containing two lakes. The earliest eruptive products (less than 0.73 Ma) consist of a sequence of ash-flow and airfall tuffs. Caldera collapse is thought to be associated with major ash deposits from about 0.5 and 0.3-0.5 Ma. These eruptions were preceded by the emplacement of numerous mafic cones and vents, and silicic lava domes and flows, many of which are aligned NNW and NNE parallel to regional fault zones. Six major eruptions from the early Holocene to about 1,300 years ago have included both basaltic lava flows from flank vents, the explosive ejection of rhyolitic pumice and pyroclastic flows, and the extrusion of obsidian flows within the caldera.
Sintesi da Wikipedia
Riassunto in ingleseNewberry Volcano is a large, active, shield-shaped stratovolcano located about 20 miles (32 km) south of Bend, Oregon, United States, 35 miles (56 km) east of the major crest of the Cascade Range, within the Newberry National Volcanic Monument. Its highest point is Paulina Peak. Newberry is the largest volcano in the Cascade Volcanic Arc, with an area of 1,200 square miles (3,100 km2) when its lava flows are taken into account. From north to south, the volcano has a length of 75 miles (121 km), with a width of 27 miles (43 km) and a total volume of approximately 120 cubic miles (500 km3). It was named for the geologist and surgeon John Strong Newberry, who explored central Oregon for the Pacific Railroad Surveys in 1855.
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Storia delle eruzioni
11 registrateGlossarioCronologia dettagliata
- 690 (±100 anni)VEI 4Stima geologica690 – fine sconosciutaS caldera wall
- 490 (±100 anni)VEI 4Stima geologica490 – fine sconosciutaSouth caldera wall
- 1450 a.C.VEI ?Stima geologica1450 a.C. – fine sconosciutaSouth of East Lake
- 4450 a.C.VEI ?Stima geologica4450 a.C. – fine sconosciutaCenter, N & S caldera, upper SE flank
- 4690 a.C. (±150 anni)VEI 0Stima geologica4690 a.C. – fine sconosciutaNW rift zone
- 4770 a.C. (±75 anni)VEI ?Stima geologica4770 a.C. – fine sconosciutaNW rift zone (Sugarpine Butte)
- 4860 a.C. (±150 anni)VEI 0Stima geologica4860 a.C. – fine sconosciutaNW rift zone
- 4960 a.C. (±100 anni)VEI ?Stima geologica4960 a.C. – fine sconosciutaEast Lake fissure, south flank
- 5070 a.C. (±150 anni)VEI 3Stima geologica5070 a.C. – fine sconosciutaLower NW rift zone (Lava Butte)
- 5260 a.C. (±150 anni)VEI 0Stima geologica5260 a.C. – fine sconosciutaNW rift zone (Lava Cast Forest)
- 9210 a.C. (±1200 anni)VEI ?Stima geologica9210 a.C. – fine sconosciutaSouth and east caldera rim
Vulcani nelle vicinanze
Link esterni
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