Smithsonian Global Volcanism ProgramVNUM 312132

Alaska Peninsula Arc at 155.4°W

Alaska Peninsula Volcanic Arc, United States. This page separates the permanent volcano catalogue, historical eruption records, and selective weekly activity reports.

Coordinates: 57.87° N, 155.41° W
Elevation: 402 m
Last recorded eruption: Not supplied
Historical eruption records: 0
Primary type: Lava dome
Evidence: Evidence Credible
GVP database: 5.4.0
Catalogue revision: Revision 2

Volcano profile

Volcanic landform: Minor (Silicic)
Tectonic setting: Subduction zone / Continental crust (> 25 km)
Geologic epoch: Holocene
Major rock type: No Data (checked)
Region: North America Volcanic Regions
Subregion: Alaska Peninsula Volcanic Arc

Geological summary

A small unnamed lava dome and an associated lava flow about 30 km E of Becharof Lake and 8 km NW of Alinchak Bay are not significantly modified by glacial erosion. Detterman et al. (1987) suggested a Holocene age for the small dome. Lava flows traveled a short distance to the north.

Separate activity dataset

Weekly volcanic activity reports

Preliminary and selective

Smithsonian/USGS weekly reports are selective and preliminary. They are not a comprehensive list of all eruptions or volcanic activity.

No weekly report appears on this page. Absence from the weekly report does not establish an absence of volcanic activity.

Historical catalogue records

Eruption history

Dates can be approximate, incomplete, or BCE. These are historical catalogue observations, not a statement about present activity.

No historical eruption records appear on this page.

Source and attribution

Source: Data: Smithsonian Institution Global Volcanism Program, Volcanoes of the World.

View the original Smithsonian GVP record

Global Volcanism Program, 2026. Volcanoes of the World 5.4.0.

The GVP database is scientific documentation that changes as evidence is reviewed. Historical dates may be approximate or uncertain. This platform is not an official emergency-warning service.

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Data freshness

Source updated: Not supplied
Retrieved: 11 Oct 2026, 13:07 UTC
GVP database version: 5.4.0
Catalogue revision: 2

Source-update and retrieval times describe this catalogue record. Each weekly report carries its own publication date and preliminary status.