Isanotski Volcano, USA

Glaciers drape the ruggedly dissected upper flanks of Isanotski volcano and its dramatic summit pinnacles.

Isanotski, locally known as Ragged Jack, is at the center of an E-W-trending group of three volcanoes on Unimak Island.

Four poorly documented historical eruptions were noted in the 18th and 19th centuries.

Some or all of these eruptions, however, could have been from neighboring Shishaldin volcano, and historical eruptions of Isanotski must be considered unlikely, given the extreme degree of erosional dissection.

Rugged pinnacles form the summit of the deeply eroded Isanotski stratovolcano, locally known as Ragged Jack.

Isanotski is at the center of an E-W-trending group of three volcanoes on eastern Unimak Island.

Four poorly documented historical eruptions were noted in the 18th and 19th centuries.

However, Miller et al. (1998) considered that some or all of these eruptions could have been from neighboring Shishaldin volcano and that historical eruptions of Isanotski must be considered unlikely, given the extreme degree of erosional dissection.

PHOTO SOURCE: courtesy of Alaska Volcano Observatory, 1994, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.

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