Kaguyak is a Holocene stratovolcano in Katmai National Park. An explosive eruption in about 325 A.D. produced pyroclastic flows and had a VEI of 6, making it one of the largest known historic eruptions in North America. This eruption removed much of the top of the volcano to create a caldera. The caldera now contains a crater lake. Two domes have grown and coalesced inside the caldera (see above photo). A smaller dome has grown just above lake level near the center of the caldera. Photo by Jay Robinson, National Park Service.



Kaguyak. Photo by Jay Robinson, National Park Service.

Sources of Information

Kienle, J., Swanson, S.E., and Pulpan, H., 1983, Magmatism and subduction in the eastern Aleutian arc: in Shimozuru, D., and Yokoyama, I., (eds.), Arc Volcanism: Physics and Tectonics, D. Reidel, Boston, p. 191-224.

Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.

Swanson, S.E., Kienle, J., and Fenn, P.M., 1981, Geology and petrology of Kaguyak Crater, Alaska: EOS, Trans. American Geophysical Union, v. 62, p. 1,062.

Wood, C.A., and Kienle, J., 1993, Volcanoes of North America: Cambridge University Press, New York, 354 p.

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United States