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.
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.