Aniakchak

Country: United States
Volcanic Region Group: North America Volcanic Regions
Volcanic Region: Alaska Peninsula Volcanic Arc
Volcano Landform: Caldera
Primary Volcano Type: Caldera
Activity Evidence: Eruption Observed
Last Known Eruption: 1931 CE
Latitude: 56.88
Longitude: -158.17
Elevation (meters): 1341
Tectonic Setting: Subduction zone / Continental crust (>25 km)
Dominant Rock Type: Andesite / Basaltic Andesite
Last Updated: 2026-05-05 22:31:29

Current Ash Alerts

Title: Aniakchak (United States) - Report for 15 January-21 January 2026
Description:

The Alaska Volcano Observatory (AVO) reported that on 15 January strong winds in areas NW of Aniakchak and E of Port Heiden dispersed unconsolidated ash up to 1.8 km (6,000 ft) a.s.l. to the NW. The ash cloud was visible in satellite images. Both the Volcano Alert Level and the Aviation Color Code remained at Unassigned due to a temporary power outage affecting monitoring data from the volcano.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Link: https://volcano.si.edu/reports_weekly.cfm
Guid: https://volcano.si.edu/reports_weekly.cfm#vn_312090
No general news available

Current Alert Status

Alert Level: NORMAL
Color Code: GREEN
Cap Certainty: NULL
Cap Severity: NULL
Cap Urgency: NULL
Is Elevated Cap:
Prev Elevated Cap:
Notice Identifier: DOI-USGS-AVO-2026-05-05T20:15:40+00:00
Pub Date: 2026-05-05 22:31:29
Sent Date Cap: 2026-05-05 22:31:29
Cap Expires: 2026-05-05 22:31:29
Mail Subject: Alaska Volcano Observatory: Aniakchak
Author: Alaska Volcano Observatory
Synopsis: Archived
Guid: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2026-05-05T20:15:40+00:00
Prev Guid: NULL
Msg Type: Archived
Notice Type Cd: IS
Notice URL: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-AVO-2026-05-05T20:15:40+00:00
Prev Notice URL: NULL
Notice Data: https://volcanoes.usgs.gov/hans-public/api/notice/getNotice/DOI-USGS-AVO-2026-05-05T20:15:40+00:00
Highest Alert Level: NORMAL
Highest Color Code: GREEN
Volcano Cds CSV: ak14

Notice Sections:

lat: 56.9058
lng: -158.209
vnum: 312090
vName: Aniakchak
region: Alaska Peninsula
vImage:
summary:

Power has been sufficiently restored to the Port Heiden Receive Facility, allowing stable data flow from Aniakchak seismic stations. There are now enough reliable data to establish the real-time state of the volcano. Due to this, Aniakchak Volcano is moving from UNASSIGNED to GREEN/NORMAL.

Aniakchak Volcano had been at UNASSIGNED since December 23, 2025 due to a lack of data received from Aniakchak seismic stations following a power outage at the Port Heiden Receive Facility. Repairs have since been made to the Port Heiden Receive Facility, sufficiently restoring data flow from the Aniakchak network.

synopsis: AVO Aniakchak GREEN/NORMAL - Port Heiden Receive Facility repairs have sufficiently restored power, moving monitoring status of Aniakchak Volcano from UNASSIGNED to GREEN/NORMAL
colorCode: GREEN
sectionId: DOI-USGS-AVO-2026-05-05T20:15:48+00:00
alertLevel: NORMAL
sectionHtml:

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Tuesday, May 5, 2026, 2:31 PM AKDT (Tuesday, May 5, 2026, 22:31 UTC)


ANIAKCHAK (VNUM #312090)
56°54'21" N 158°12'32" W, Summit Elevation 4400 ft (1341 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Power has been sufficiently restored to the Port Heiden Receive Facility, allowing stable data flow from Aniakchak seismic stations. There are now enough reliable data to establish the real-time state of the volcano. Due to this, Aniakchak Volcano is moving from UNASSIGNED to GREEN/NORMAL.

Aniakchak Volcano had been at UNASSIGNED since December 23, 2025 due to a lack of data received from Aniakchak seismic stations following a power outage at the Port Heiden Receive Facility. Repairs have since been made to the Port Heiden Receive Facility, sufficiently restoring data flow from the Aniakchak network.



Aniakchak volcano, located in the central portion of the Alaska Peninsula, consists of a stratovolcano edifice with a 6 mile (10 km) diameter summit caldera. The caldera-forming eruption occurred around 3,500 years ago. Post-caldera eruptions have produced lava domes, tuff cones, and larger spatter and scoria cone structures, including Half-Cone and Vent Mountain, all within the caldera. The most recent eruption occurred in 1931 and created a new vent and lava flows on the western caldera floor while spreading ash over much of southwestern Alaska. Aniakchak volcano is 16 miles (26 km) southeast of the nearest community, Port Heiden, and 416 miles (670 km) southwest of Anchorage, Alaska. It is located in Aniakchak National Monument and Preserve.





CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS [email protected] (907) 786-7497

David Fee, Coordinating Scientist, UAFGI [email protected] (907) 378-5460



Contact AVO: https://avo.alaska.edu/contact

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

NOTICES
ADS