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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 57.05°N
  • 135.75°W

  • 970 m
    3182 ft

  • 315040
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Edgecumbe.

 Available Weekly Reports

There are no Weekly Reports available for Edgecumbe.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2220 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected)
3810 BCE ± 75 years Unknown Confirmed   Radiocarbon (uncorrected)
7220 BCE ± 150 years Unknown Confirmed   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.

Beget J E, Motyka R J, 1998. New dates on late Pleistocene dacitic tephra from the Mount Edgecumbe volcanic field, southeastern Alaska. Quat Res, 49: 123-125.

Brew D A, Muffler L J P, Loney R A, 1969. Reconnaissance geology of the Mount Edgecumbe volcanic field, Kruzof Island, southeastern Alaska. U S Geol Surv Prof Pap, 650-D: 1-18.

Henning R A, Rosenthal C H, Olds B, Reading E (eds), 1976. Alaska's volcanoes, northern link in the ring of fire. Alaska Geog, 4: 1-88.

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

Riehle J R, 1996. The Mount Edgecumbe volcanic field: a geologic history. U S Dept Agriculture, 42 p.

Riehle J R, Brew D A, Lanphere M A, 1989. Geologic map of the Mount Edgecumbe volcanic field, Kruzof Island, southeastern Alaska. U S Geol Surv Map, I-1983.

Riehle J R, Champion D E, Brew D A, Lanphere M A, 1992. Pyroclastic deposits of the Mount Edgecumbe volcanic field, southeast Alaska: eruptions of a stratified magma chamber. J Volc Geotherm Res, 53: 117-143.

Riehle J R, Mann D H, Peteet D M, Engstrom D R, Brew D A, Meyer C E, 1992. The Mount Edgecumbe tephra deposits, a marker horizon in southeastern Alaska near the Pleistocene-Holocene boundary. Quat Res, 37: 183-202.

Smith R L, Shaw H R, Luedke R G, Russell S L, 1978. Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States. U S Geol Surv Open-File Rpt, 78-925: 1-25.

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

The Pleistocene-to-Holocene Mount Edgecumbe volcanic field covers about 260 sq km of Kruzov Island west of Sitka in the SE panhandle of Alaska. The basaltic-to-dacitic field is dominated by the large composite cones of Mount Edgecumbe, Crater Ridge, and Shell Mountain and has an unusual tectonic setting only 16 km east of the Queen Charlotte-Fairweather transform fault separating the North American and Pacific plates. Mount Edgecumbe, a 970-m-high stratovolcano with a well-defined crater, is the largest volcano of the Edgecumbe field. Crater Ridge is truncated by a 1.6-km-wide, 240-m-deep caldera. These and other vents of the volcanic field are oriented along a SW-NE line. Volcanic activity originated about 600,000 years ago along fissures cutting Kruzof Island. A series of major silicic explosive eruptions took place about 9000-13,000 radiocarbon years ago. The latest dated eruptions were phreatomagmatic explosions during the mid-Holocene, and all postglacial activity has been pyroclastic. Reports of historical eruptions of Mount Edgecumbe are unsubstantiated.