VOLCANOYELLOW

Shishaldin volcano

USGS update Sunday, October 25, 2026 · 20:24 UTC

Shishaldin, in the Aleutians, is at Volcano Alert Level ADVISORY and Aviation Color Code YELLOW as of October 25, 2026, according to the Alaska Volcano Observatory. Low-level unrest continues.

Alert levelAdvisory

Aviation codeYellow

Summit2,857 m · 9,374 ft

RegionAleutians

ObservatoryAVO

Location54.76°N 163.97°W

See it on the live 3D globe →Watch live on YouTube 🔔 Get alerts near you

Seen from space

Satellite picture, Satellite view · October 24, 2026 — Satellite view · October 24, 2026

True color from the VIIRS instrument on the NOAA-20 satellite. Red dots mark heat the satellite detected, such as lava or fires. The ring marks where the event was reported. Pictures: NASA Worldview (GIBS) from the daily satellite passes; clouds can hide the ground on some days.

Latest from the observatory

Unrest continues with elevated seismic activity with small earthquakes and tremor detected over the past day. No unusual activity observed in satellite views over the past day, but occasional clear web camera views of the summit showed minor steam emissions. Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions.

About Shishaldin

Shishaldin Volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a conical stratovolcano with a base diameter of approximately 10 miles (16 km). It is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 28 confirmed eruptions since 1824. Most eruptions are relatively small, although activity during the 1999 and 2023 eruptions generated ash columns that reached up to 46,000 ft (16 km) above sea level.

How U.S. volcano alerts work

Alert level	Color code	Meaning
Normal	Green	Typical background, non-eruptive activity.
Advisory	Yellow	Elevated unrest above known background levels.
Watch	Orange	Heightened unrest with a greater chance of eruption, or a minor eruption under way.
Warning	Red	A hazardous eruption is imminent, under way or suspected.

The alert level speaks to people on the ground; the color code to aircraft, since volcanic ash can stop jet engines.

Did you know?

Biggest volcano on land. Mauna Loa in Hawaii is the largest active volcano on Earth by volume.

Official updates: USGS notice · USGS Volcano Hazards Program.

More: every volcano page · all events