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Glacier Peak

Find U.S. Volcano

Glacier Peak is the most remote of the five active volcanoes in Washington State, and more than a dozen glaciers descend its flanks, prompting its name.

Quick Facts

Location: Washington, Snohomish County

Latitude: 48.112° N

Longitude: 121.113° W

Elevation: 3,213 (m) 10,541 (f)

Volcano type: Stratovolcano

Composition: Dacite

Most recent eruption: 1,100 years ago

Threat Potential: Very High*

*based on the National Volcano Early Warning System

Summary

Glacier Peak volcano viewed from the west, Washington....
Glacier Peak volcano viewed from the west, Washington.

The peak wasn't known by settlers to be a volcano until the 1850's, when Native Americans mentioned to naturalist George Gibbs that "another smaller peak to the north of Mount Rainier once smoked." Glacier Peak is not prominently visible from any major population center, and so its attractions, as well as its hazards, tend to be overlooked. Yet since the end of the most recent ice age, this volcano has produced some of the largest and most explosive eruptions in the conterminous United States. Within this time period, it has erupted multiple times during at least six separate episodes. Glacier Peak and Mount St. Helens are the only volcanoes in Washington State that have generated very large explosive eruptions in the past 15,000 years.

News

link

Status of (mostly) Washington's Volcanoes: Report to Emergency Managers 2020-2021

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Which U.S. volcanoes pose a threat?

Publications

2018 update to the U.S. Geological Survey national volcanic threat assessment

When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners. This update

Authors
John W. Ewert, Angela K. Diefenbach, David W. Ramsey

Science

Geology and History of Glacier Peak

Glacier Peak (3214 m, 10544 ft) is a stratovolcano composed mainly of dacite, which is located about 100 km (65 mi) northeast of Seattle and 110 km (70 mi) south of the International Boundary with Canada. It lies in the rugged and scenic Glacier Peak Wilderness Area, in the Mt. Baker-Snoqualmie National Forest and rises only a few thousand feet above neighboring peaks that reach 2,700 m.
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Geology and History of Glacier Peak

Glacier Peak (3214 m, 10544 ft) is a stratovolcano composed mainly of dacite, which is located about 100 km (65 mi) northeast of Seattle and 110 km (70 mi) south of the International Boundary with Canada. It lies in the rugged and scenic Glacier Peak Wilderness Area, in the Mt. Baker-Snoqualmie National Forest and rises only a few thousand feet above neighboring peaks that reach 2,700 m.
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Eruption History of Glacier Peak

Timeline and information about past eruptions at Glacier Peak.
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Eruption History of Glacier Peak

Timeline and information about past eruptions at Glacier Peak.
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Summit of Glacier Peak

The uppermost 800 m (2,600 ft) of Glacier Peak can be subdivided into three parts, two false summits and the actual summit
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Summit of Glacier Peak

The uppermost 800 m (2,600 ft) of Glacier Peak can be subdivided into three parts, two false summits and the actual summit
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