Sanford is a large shield volcano. It has no known eruptions. Sanford is the highest volcano in the Wrangell volcanic field. It rises 11,733 ft. (3577 m) from its base to its summit. The upper part of Sanford is covered with snow and ice all year long. This area of the volcano is young. It was built on at least three shield volcanoes. These make up the north, west and south Sanford eruptive centers. These centers contain dikes and vent deposits. They are also the center of straight rift zones with vents. Lavas from the volcano are made mostly of basalt and andesite. Sanford is about 21 miles (34 km) wide.
Sources of Information:
Wood, Charles A. and Kienle, Jurgen, "Volcanoes of North America United States and Canada," Cambridge University Press, 347 pp., 1990.