Tracking Volcanoes U.S. Geological Survey View Larger Map The northern portion of the Pacific Ring of Fire is a nearly continuous chain of active (erupting) and inactive (dormant) volcanoes. It stretches from northern California, across southcentral Alaska and the Aleutian Islands to Japan. © Juergen Kienle Saw a plume of steam on the horizon today? Check out the Alaska Volcano Observatory website for current volcanic activity. Cook Inlet Volcanoes Timeline 10 Million Years Ago Volcanoes west of Kachemak Bay begin to form along the Aleutian and Alaska Ranges. There are seven in all - Fourpeaked, Douglas, Augustine, Iliamna, Redoubt, Spurr, and Hayes from south to north. Into the Fire Celia Anderson & Sarah Glaves 19,000 Years Ago Augustine Island begins to form as a volcano. 3,500 Years Ago Hayes Volcano (discovered in 1975) has last known catsastrophic eruption. Circa 1540 Augustine erupts 1812 Augustine erupts 1883 Augustine erupts Tsunami hits English Bay (now called Nanwalek)   1902 Redoubt erupts © Juergen Kienle 1908 Augustine erupts 1935 Augustine erupts 1953 Spurr erupts 1963-64 Augustine erupts 1966-67 Redoubt erupts 1968 Redoubt erupts   1976 Augustine erupts   1986 Augustine erupts   1989-90 Redoubt erupts   1992 Spurr erupts

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