Steller

Stratovolcano in United States

Key Facts

Elevation

2,279 m (7,477 ft)

Type

Stratovolcano

Location

58.430°, -154.389°

Region

Alaska Peninsula Volcanic Arc

Rock Type

Andesite / Basaltic Andesite

Tectonic Setting

Subduction zone

Location

Loading map...

Overview

Mount Steller is part of a chain of closely spaced volcanic peaks oriented NE-SW in Katmai National Park and lies between Mount Denision and Kukak volcanoes. Uncertainty surrounds the number and location of vents in this heavily glaciated area. The precise age of the most recent activity at Steller is not known, but the volcano was considered to have been active during the Holocene by Nye et al.

(1998).

Volcanic Hazards & Risk Assessment

Primary Hazards

Pyroclastic flows
Lava flows
Volcanic bombs and ballistics
Lahars and mudflows

Risk Level

Population at RiskModerate

Infrastructure RiskModerate

Aviation RiskSignificant

Geological Composition & Structure

Rock Types

Primary

Andesite / Basaltic Andesite

Silica Content

Intermediate (57-63% SiO₂)

Tectonic Setting

Subduction zone

Formed by oceanic plate subduction, typically producing explosive eruptions due to water-rich magmas.

Age & Formation

Epoch

Holocene

Evidence

Evidence Credible

Eruption Statistics & Analysis

Metric	Value	Global Ranking	Significance
Total Recorded Eruptions	Unknown	Low	Moderately active volcano
Maximum VEI	VEI Unknown	Minor	Local impact potential
Recent Activity	Unknown	Historical	Historically active

Monitoring & Alert Status

Monitoring Networks

Global Volcanism Program

International eruption database

Current Status

Normal

No recent activity. Routine monitoring continues.

Nearby Volcanoes in North America Volcanic Regions

Regional Volcanic Activity

The North America Volcanic Regions contains multiple active volcanic systems. Cross-regional magma interactions and tectonic stresses can influence eruption patterns across the entire arc. Monitor regional seismic activity and volcanic alerts.

Quick Info

•Smithsonian ID: 312220
•Evidence: Evidence Credible
•Epoch: Holocene

About the Photo

The rounded peak of Mount Steller is visible on the horizon at right-center beyond the slopes of Denison; the summit ridge of Snowy volcano forms the far-left skyline in this long-distance NE-looking view. The slopes of Mount Denison are seen on the right half of the photo, between the pointed summit in the center and the flatter peak to the far right, between which a glacier descends towards the middle of the image.

Photo courtesy of Alaska Volcano Observatory, U.S. Geological Survey, 1997.