Redoubt (United States)

Status Unknown Eruption 2009 3108m
Stratovolcano (Subduction zone / Continental crust (> 25 km))


Redoubt is a 3108-m-high glacier-covered stratovolcano with a breached summit crater in Lake Clark National Park about 170 km SW of Anchorage. Next to Mount Spurr, Redoubt has been the most active Holocene volcano in the upper Cook Inlet. The volcano was constructed beginning about 890,000 years ago over Mesozoic granitic rocks of the Alaska-Aleutian Range batholith. Collapse of the summit of Redoubt 10,500-13,000 years ago produced a major debris avalanche that reached Cook Inlet. Holocene activity has included the emplacement of a large debris avalanche and clay-rich lahars that dammed Lake Crescent on the south side and reached Cook Inlet about 3500 years ago. Eruptions during the past few centuries have affected only the Drift River drainage on the north. Historical eruptions have originated from a vent at the north end of the 1.8-km-wide breached summit crater. The 1989-90 eruption of Redoubt had severe economic impact on the Cook Inlet region and affected air traffic far beyond the volcano.

Mount Redoubt rises to 3108 m on the west side of Cook Inlet, 170 km SW of Anchorage. Redoubt volcano was constructed over a basement of glacially eroded Mesozoic granitic rocks, seen here in the foreground. The volcano has been very active during the Holocene, producing at least 30 tephra layers in the Cook Inlet basin stratigraphy. A steam plume rises from the summit crater, which is breached to the north, in this view from the NE following its 1989-90 eruption. Iliamna volcano is visible in the left distance.

Photo by Christina Neal (U.S. Geological Survey, Alaska Volcano Observatory).

Last updated 2019-10-30 00:30:03

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Latest activity


Anchorage VAAC - 2019-08-17 21:50:00 UTC ()


Anchorage VAAC - 2019-08-17 18:56:00 UTC ()


Anchorage VAAC - 2019-08-17 13:03:00 UTC ()