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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 43.722°N
  • 121.229°W

  • 2434 m
    7984 ft

  • 322110
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Newberry.

 Available Weekly Reports

There are no Weekly Reports available for Newberry.

Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0690 ± 100 years Unknown Confirmed 4 Radiocarbon (corrected) S caldera wall, Big Obsidian Flow
0490 ± 100 years Unknown Confirmed 4 Radiocarbon (corrected) South caldera wall
1450 BCE (?) Unknown Confirmed   Hydration Rind South of East Lake
4450 BCE (?) Unknown Confirmed   Hydration Rind Center, N & S caldera, upper SE flank
4690 BCE ± 150 years Unknown Confirmed 0 Radiocarbon (corrected) NW rift zone, Lava Cascade flow
4770 BCE ± 75 years Unknown Confirmed   Radiocarbon (corrected) NW rift zone (Sugarpine Butte)
4860 BCE ± 150 years Unknown Confirmed 0 Radiocarbon (corrected) NW rift zone, Forest Road flow
4960 BCE ± 100 years Unknown Confirmed   Radiocarbon (corrected) East Lake fissure, south flank
5070 BCE ± 150 years Unknown Confirmed 3 Radiocarbon (corrected) Lower NW rift zone (Lava Butte)
5260 BCE ± 150 years Unknown Confirmed 0 Radiocarbon (corrected) NW rift zone (Lava Cast Forest)
9210 BCE ± 1200 years Unknown Confirmed   Radiocarbon (corrected) South and east caldera rim

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Castro J, Cashman K, Joslin N, Olmsted B, 2002. Structural origin of large gas cavities in the Big Obsidian Flow, Newberry volcano. J Volc Geotherm Res, 114: 313-330.

Gardner J E, Carey S, Sigurdsson H, 1998. Plinian eruptions at Glacier Peak and Newberry volcanoes, United States: implications for volcanic hazards in the Cascade Range. Geol Soc Amer Bull, 110: 173-187.

Green J, Short N M, 1971. Volcanic Landforms and Surface Features: a Photographic Atlas and Glossary. New York: Springer-Verlag, 519 p.

Higgins M W, 1973. Petrology of Newberry volcano, central Oregon. Geol Soc Amer Bull, 84: 455-488.

Hildreth W E, 2007. Quaternary magmatism in the Cascades--geologic perpectives. U S Geol Surv Prof Pap, 1744: 1-125.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Jensen R A, 1995. Roadside Guide to the Geology of Newberry volcano. Bend, Oregon: The Press Pro's, 155 p.

Kuehn S C, Foit F F Jr, 2006. Correlation of widespread Holocene and Pleistocene tephra layers from Newberry volcano, Oregon, USA, using glass compositions and numerical analysis. Quat Internatl, 148: 113-137.

MacLeod N S, Sherrod D R, 1988. Geologic evidence for a magma chamber beneath Newberry volcano, Oregon. J Geophys Res, 93: 10,067-10,079.

MacLeod N S, Sherrod D R, Chitwood L A, 1982. Geologic map of Newberry volcano, Deschutes, Klamath, and Lake Counties, Oregon. U S Geol Surv Open-File Rpt, 82-847: map and 27 p text.

MacLeod N S, Sherrod D R, Chitwood L A, McKee E H, 1981. Newberry volcano, Oregon. U S Geol Surv Circ, 838: 85-91.

Peterson N V, Groh E A, 1966. Lunar Geological Field Conference guidebook. Oregon Dept Geol Min Ind, 51 p.

Sherrod D R, Smith J G, 1990. Quaternary extrusion rates of the Cascade Range, northwestern United States and southern British Columbia. J Geophys Res, 95: 19,465-19,474.

Newberry volcano, situated east of the Cascade Range, is one of the largest volcanoes in the conterminous United States, covering an area of about 1600 sq km. The low-angle basaltic to basaltic-andesite shield volcano is dotted with more than 400 cinder cones; however Newberry has also produced major silicic eruptions associated with formation of a 6 x 8 km wide summit caldera containing two caldera lakes. The earliest eruptive products (<0.73 million years ago) (Ma) consist of a sequence of ash-flow and airfall tuffs. Caldera collapse is thought to be associated with major ash flows emplaced 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. A rhyolitic magma chamber has been present throughout the Holocene. Six major eruptive episodes from the early Holocene to about 1300 years ago have included both the eruption of basaltic lava flows from flank vents and the explosive ejection of rhyolitic pumice and pyroclastic flows and the extrusion of obsidian flows within the caldera.