No latest activity reported for Snowy Mountain.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

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.

Fierstein J, 2007. Explosive eruptive record in the Katmai region, Alaska Peninsula: an overview. {Bull Volc}, 69: 469-509

Hildreth W E, Fierstein J, Lanphere M A, Siems D F, 2001. Snowy Mountain: a pair of small andesite-dacite stratovolcanoes in Katmai National Park. {In}: Gough L P, Wilson F H (eds) Geologic Studies in Alaska by the U.S. Geological Survey, 1999, {U S Geol Surv Prof Pap}, 1633: 13-34

Hildreth W, Lanphere M A, Fierstein J, 2003b. Geochronology and eruptive history of the Katmai volcanic cluster, Alaska Peninsula. {Earth Planet Sci Lett}, 214: 93-114

Motyka R J, Liss S A, Nye C J, Moorman M A, 1993. Geothermal resources of the Aleutian arc. {Alaska Div Geol Geophys Surv, Prof Rpt}, no 114, 17 p and 4 map sheets

Smith R L, Shaw H R, 1975. Igneous-related geothermal systems. {U S Geol Surv Circ}, 726: 58-83

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

Ward P L, Matumoto T, 1967. A summary of volcanic and seismic activity in Katmai National Monument, Alaska. {Bull Volc}, 31: 107-130

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

Glacier-covered, 2161-m-high Snowy Mountain, located 15 km NE of Mount Katmai, is the SW-most of a chain of closely spaced volcanoes extending NE along the crest of the Alaska Range. More than 90% of the compound Snowy volcano is mantled by glacial ice, which prompted the naming of the volcano by members of the 1917 Katmai expedition. Two small andesitic-dacitic stratovolcanoes, SW Snowy and NE Snowy, originated about 200,000 years ago. Only NE Snowy has been active during the Holocene. Late-Holocene collapse of this volcano produced a large debris avalanche that traveled to the north and left a large breached crater inside which a blocky lava dome was constructed. Peat beneath an ash layer thought to be associated with the the lava dome was radiocarbon dated at about 250 +/- 70 years ago. No historical eruptive activity has been documented, but fumarolic activity has been observed at NE Snowy. A zone of persistent diffuse shallow seismicity is located on and NW of the volcano.