Shishaldin is part of the Aleutian Islands, which are extremely volcanicly active because they are part of the Ring of Fire, where the Pacific Plate is continually subducting under other plates. The Wrangell Mountain chain covers over 2000 square miles and is volcanicly active. it includes one of the largest active volcanoes in the world. Wrangell is a shield volcano and has a caldera at its summit although it only has minor steam plumes and phreatic ash. Also near Shishaldin is the Spurr Volcano, which is a stratovolcano as Shishaldin is as well. it also has a large explosion caldera. Its mean peak has not experience eruption in what scientists have predicted, over 10000 years. Its smaller peak, Crater Peak, has erupted in 1953 and 1992, showering ash on Anchorage, Alaska. Crater Peak is still monitored closely.
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