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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 61.38°N
  • 141.75°W

  • 5005 m
    16416 ft

  • 315030
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Churchill.

 Available Weekly Reports

There are no Weekly Reports available for Churchill.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0800 ± 100 years Unknown Confirmed 6 Radiocarbon (corrected)
0060 ± 200 years Unknown Confirmed 6 Radiocarbon (uncorrected)

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.

Clague J J, Evans S G, Rampton V N, Woodsworth G J, 1995. Improved age estimates for the White River and Bridge River tephras, western Canada. Can J Earth Sci, 32: 1172-1179.

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

Lerbekmo J F, Campbell F A, 1969. Distribution, Composition, and Source of the White River Ash, Yukon Territory.. Can J Earth Sci, 6: 109-116.

Lerbekmo J F, Westgate J A, Smith D G W, Denton G H, 1975. New data on the character and history of the White River volcanic eruption, Alaska. In: Suggate R P and Cresswell M M (eds) {Quaternary Studies}, Wellington: Roy Soc New Zeal, p 203-209.

McGimsey R G, Richter D H, DuBois G D, Miller T P, 1992. A postulated new source for the White River Ash, Alaska. U S Geol Surv Bull, 1999: 212-218.

Richter D H, Preece S J, McGimsey R G, Westgate J A, 1995. Mount Churchill, Alaska: source of the late Holocene White River Ash. Can J Earth Sci, 32: 741-748.

Richter D H, Rosenkrans D S, Steigerwald M J, 1995. Guide to the volcanoes of the western Wrangell Mountains, Alaska--Wrangell-St. Elias National Park and Preserve. U S Geol Surv Bull, 2072: 1-31.

Robinson S D, 2001. Extending the Late Holocene White River Ash distribution, northwestern Canada. Arctic, 54: 157-161.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

The Bona-Churchill massif in the St. Elias Mountains forms the highest Quaternary volcano in the United States. A 2.7 x 4.2 km wide caldera caps the summit of 4766-m-high Mount Churchill, which is now known to be the source of the White River Ash, produced during two of the largest explosive eruptions in North America during the past 2000 years (McGimsey et al. 1992). The 5005-m-high summit of Mount Bona lies 4 km across a high saddle from the younger Mount Churchill. The source vent of the widespread bilobate White River Ash deposit, which blankets more than 340,000 sq km of eastern Alaska and NW Canada, was initially thought to be a pumice mound that is mostly buried beneath the Klutlan Glacier NE of Churchill volcano. More recent work has revealed thick young pumice deposits mineralogically and chemically similar to the White River Ash deposits along the rim of the Mount Churchill caldera.