Pavlof (55.42N, 161.90W) and Pavlof Sister (55.45N, 161.95W) are a pair of symmetrical stratovolcanoes on the Alaska Peninsula. Pavlof is probably the most consistently active volcano in the Aleutian arc, with nearly 40 eruptions since 1790. Eruptions are typically Strombolian. A 1928 expedition to Pavlof was directed by Dr. Thomas Jaggar, founder of the Hawaiian Volcano Observatory. Pavlof Sister is less active, with a single eruption from 1762-1786. In the above photograph Pavlof Sister is on the left and Pavlof on the right (date and photographer unknown).
Slightly dissected cone of Pavlof Sister. . From Plate 2 in Kennedy and Waldron (1955).
More Information
Sources of Information:
Jaggar, T.A., 1929, Mapping the home of the great brown bear: Adventures of the National Geographic SocietyÕs Pavlof Volcano expedition to Alaska: National Geographic.
Kennedy, G.C., and Waldron, H.H., 1955, Geology of Pavlof and vicinity Alaska: U.S. Geological Survey Bulletin 1028-A, p. 1-18.
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, AZ, 349 p.
Wood, C.A., and Kienle, J., 1990, Volcanoes of North America: United States and Canada: Cambridge University Press, New York, NY, 354 p.