Volcanoes of the Aleutian Islands (44)

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Significant volcanic eruptions: Aleutian Islands

In historic times, at least 24 volcanoes have been active in Aleutian Islands, including Atka, Kanaga, and Shishaldin volcanoes. A total of 221 eruptions have been witnessed and documented since 1700.
The table below lists the most recent volcanic eruptions, significant eruptive episodes or related events in Aleutian Islands since around 2000.

Date	Volcano	VEI	Region
2021 May 25 - ongoing	Great Sitkin	2	United States, Aleutian Islands
2024 Mar 27	Atka	?	United States, Aleutian Islands
2023 Dec 18	Kanaga	1	Andreanof Islands, Aleutian Islands, Alaska
2023 Jul 11 ±1 d. -	Shishaldin	3	Aleutian Islands, Alaska
2021 Feb 2 ±2 d. - 2023 May 5	Semisopochnoi North Cerberus	2	United States, Aleutian Islands
2019 Dec 7 - 2020 Jun 19	Semisopochnoi North Cerberus	1	United States, Aleutian Islands
2020 Jun 1	Cleveland	3	Aleutian Islands, Alaska
2019 Jul 23 - 2020 May 4	Shishaldin Summit crater	3	Aleutian Islands, Alaska
2019 Jul 16 - Aug 24	Semisopochnoi	1	United States, Aleutian Islands
2019 Jun 1 - Jun 7	Great Sitkin	1	United States, Aleutian Islands
2016 Apr 16 - 2019 Jan 20 ±4 d.	Cleveland Summit crater	2	Aleutian Islands, Alaska
2018 Sep 8 - Oct 31	Semisopochnoi	1	United States, Aleutian Islands
2018 Jun 10 - Aug 11	Great Sitkin	1	United States, Aleutian Islands
2016 Dec 20 - 2017 Aug 30	Bogoslof Central vent, just below sea level	3	United States, Aleutian Islands
2011 Jul 19 ±7 d. - 2015 Aug 18	Cleveland Summit crater	2	Aleutian Islands, Alaska
2014 Jan 30 - 2015 Jul 3	Shishaldin Summit crater	1	Aleutian Islands, Alaska
2012 Feb 18	Kanaga E-W fissure at summit crater	2	Andreanof Islands, Aleutian Islands, Alaska
2010 May 30 - Jun 2 ?	Cleveland Summit crater	2	Aleutian Islands, Alaska
2009 Oct 2 - Dec 12 ?	Cleveland	2	Aleutian Islands, Alaska
2009 Jun 25	Cleveland	2	Aleutian Islands, Alaska
2009 Jan 2 - Jan 21	Cleveland	2	Aleutian Islands, Alaska
2008 Jul 12 - Aug 19	Okmok NE caldera floor	4?	Fox Islands, Aleutian Islands, USA
2007 Jun 17 ? - 2008 Aug 12 ?	Cleveland	2?	Aleutian Islands, Alaska
2008 Aug 7 - Aug 9 ?	Kasatochi	4	Aleutian Islands, USA
2006 Nov 25 ±5 d. - 2007 Mar 3 or before	Atka	1	United States, Aleutian Islands
2006 Feb 6 - Oct 28	Cleveland	3	Aleutian Islands, Alaska
2005 Mar 13 ? - Nov 27 ±1 d.	Cleveland	2	Aleutian Islands, Alaska
2005 Feb 23 - May 5 ±4 d.	Atka	1	United States, Aleutian Islands
2004 Feb 17 - Jul 16 ±15 d.	Shishaldin	2	Aleutian Islands, Alaska
2004 Jul 4 or before	Atka	1?	United States, Aleutian Islands
2002 Jul 16 ±15 d.	Atka	1?	United States, Aleutian Islands
2001 Feb 2 or before - Apr 15 ?	Cleveland	3?	Aleutian Islands, Alaska

Remark:

Our list of volcanic eruptions closely follows the database of eruptions of the Smithsonian's Global Volcanism Project (GVP), the internationally most recognized data source for volcanic eruptions, but also includes significant eruptive episodes or related volcano events. "Volcanic eruptions" are usually to be understood as sequences of individual eruptive episodes that can follow each other, or even overlap (if several vents are involved), and can last many years, decades or even longer. For example, the current activity of Stromboli volcano is understood as a single eruption that has been ongoing since 1934.

Sources: NOAA National Centers for Environmental Information (NCEI), Global Significant Volcanic Eruptions Database. doi:10.7289/V5TD9V7K | Global Volcanism Project / Smithsonian Institution

Aleutian Islands FAQ

+When was the last volcanic eruption in Aleutian Islands?

The last volcanic eruption in Aleutian Islands was from Atka volcano in 2024.

+When was the first documented volcanic eruption in Aleutian Islands?

The first historically documented eruption occurred 1700 from Amak volcano.

+How often do volcanoes in Aleutian Islands erupt?

Volcanoes in Aleutian Islands erupt almost every year. Since the first historically documented eruption 1700in Aleutian Islands, historic sources have shown nearly continuous volcanic activity: The Global Volcanism Project counts 221 historic eruptions until now, spanning a total of 181 out of 325 years. In other words, a volcano in Aleutian Islands is active roughly every one in 1.8 years on average. This value is likely underestimated, because the record of historically documented activity is likely inclomplete the further back in time we look.

+How active are the volcanoes in Aleutian Islands?

Aleutian Islands is volcanically very active: Since 1900, at least 19 volcanoes in Aleutian Islands have been active.Since 1900, Aleutian Islands has had 155 volcanic eruptions from 19 individual volcanoes. Volcanic eruptions have been recorded erupted during 93 years out of 126 as of now. This means, at least one volcano in Aleutian Islands has been in eruption in one in 1.4 years on average. The last volcano to erupt in Aleutian Islands was Atka volcano, which erupted in 2024, 18 months ago.

+When was the largest volcanic eruption in Aleutian Islands?

The largest eruption in Aleutian Islands in historic times was from Kasatochi volcano. It occurred in 2008. It ranks as a sub-plinian eruption with a magnitude 4 on the VEI (Volcanic Explosivity Index) scale.

Volcano List

Adagdak

(Stratovolcano 610 m / 2,001 ft)

[more info]

Akutan

(Stratovolcano 1303 m / 4,275 ft)

Akutan volcano is one of the most active stratovolcanoes of the Aleutian arc. The volcano has a 2-km-wide caldera with an active intracaldera cone. [more info]

Amak

(Stratovolcano 488 m / 1,601 ft)

[more info]

Amukta

(Stratovolcano 1066 m / 3,497 ft)

[more info]

Atka

(Stratovolcanoes 1451 m / 4,760 ft)

[more info]

Bobrof

(Stratovolcano 738 m / 2,421 ft)

[more info]

Bogoslof

(Submarine volcano 150 m / 492 ft)

Bogoslof Island in Alaska with the eroded remnants of Castle Rock lava dome from the 1796 eruption (image: Ann Harding/AVO USGS)

[more info]

Buldir

(Stratovolcano 656 m / 2,152 ft)

[more info]

Carlisle

(Stratovolcano 1620 m / 5,315 ft)

[more info]

Chagulak

(Stratovolcano 1142 m / 3,747 ft)

[more info]

Cleveland

(Stratovolcano 1730 m (5,676 ft))

The beautifully symmetrical Mount Cleveland stratovolcano forms the western half of the uninhabited Chuginadak Island in the central Aleutians, connected to the eastern half of the island by a narrow isthmus. It is one of the regions most active volcanoes, but at present has no s... [more info]

Davidof

(Stratovolcano 328 m / 1,076 ft)

[more info]

Fisher

(Stratovolcano 1112 m / 3,648 ft)

[more info]

Gareloi

(Stratovolcano 1573 m / 5,161 ft)

Gareloi volcano from the webcam on 8 June 2021

[more info]

Gilbert

(Stratovolcano 818 m / 2684 ft)

[more info]

Great Sitkin

(Stratovolcano 1740+ m / 5,709 ft)

[more info]

Herbert

(Stratovolcano 1280 m / 4,199 ft)

[more info]

Isanotski

(Stratovolcano 2446 m / 8,025 ft)

[more info]

Kagamil

(Stratovolcano 893 m / 2,930 ft)

[more info]

Kanaga

(stratovolcano 1307 m / 4,288 ft)

Kanaga Volcano Viewed from the west with Mt Moffet, Adak and Great Sitkin in the background (image taken May 8, 2010 by Cyrus Read, AVO/USGS)

Kanaga volcano is an active symmetrical stratovolcano rising 1300 m on the northern part of Kanaga Island in the western Aleutians, Alaska. It is one of the most southerly volcanoes of the central Aleutian chain.
The volcano has a small 200 m wide and 60 m deep circular sum... [more info]

Kasatochi

(Stratovolcano 314 m / 1030 ft)

Satellite image of Kasatochi volcano (c) Google Earth View

Kasatochi is a remote island forming the peak of a mostly submerged stratovolcano rising to 314 m a.s.l. in the Aleutian island chain. It is one of the volcanoes in the world that formed new islands in historic times. [more info]

Kiska

(Stratovolcano 1220 m / 4,003 ft)

[more info]

Koniuji

(Stratovolcano 273 m / 896 ft)

[more info]

Korovin

(Stratovolcano 1533 m / 5030 ft)

Korovin is a 1533 m high stratovolcano in the central Aleutian Islands and one of the most active volcanoes in Alaska. On average, it has been active every 10-15 years, its last eruption being in Nov-Dec 2006 with ash emissions. [more info]

Little Sitkin

(stratovolcano 1174 m / 3,852 ft)

Little Sitkin volcano forms a small island of the same name in the western Aleutians Islands and belongs to the Aleutian Island National Wildlife Refuge. The active stratovolcano rises 1188 m (3898 ft) in the center-northeastern part of the island. The island is located 330 km (2... [more info]

Makushin

(Stratovolcano 1800 m / 5,905 ft)

Makushin volcano is an ice-covered 1800-m-high stratovolcano on northern Unalaska Island west of the town of Dutch Harbor. The volcano contains a 2.5-km-wide caldera. Its broad, domical shape contrasts with the usual steep-sided profile of most other volcanoes in the Aleutians. [more info]

Moffett

(Stratovolcano 1196 m / 3,924 ft)

[more info]

Okmok

(Central shield complex with nested caldera 1073 m (3520 ft))

Okmok is one of the most active volcanoes in the Aleutian island chain (Alaska). It consists of a complex of shields truncated by a caldera and several active vents inside the caldera, which have built small cones and lava flows. [more info]

Recheschnoi

(Stratovolcano 1984 m / 6,509 ft)

[more info]

Roundtop

(Stratovolcano 1871 m / 6,138 ft)

[more info]

Seguam

(Stratovolcanoes 1054 m / 3,458 ft)

[more info]

Segula

(Stratovolcano 1160 m / 3,806 ft)

[more info]

Semisopochnoi

(Stratovolcano 1221 m / 4,006 ft)

[more info]

Sergief

(Stratovolcano 560 m / 1,837 ft)

[more info]

Shishaldin

(Stratovolcano 2857 m / 9,373 ft)

[more info]

Table Top

(Pyroclastic cone 792 m / 2598 ft)

[more info]

Takawangha

(Stratovolcano 1449 m / 4,754 ft)

Snow-clad Takanangha volcano on Tanaga Island (image: Loewen, M. W. via AVO / USGS)

Takawangha is a 1449-m-high, young stratovolcano on northern Tanaga Island near the western end of the Andreanof Islands in the Aleutian arc. It is capped by an ice-filled summit caldera.
Due to its remoteness, there are no historical observations of activity, but radiocarb... [more info]

Tana

(Stratovolcanoes 1170 m / 3,839 ft)

[more info]

Tanaga

(Stratovolcanoes 1806 m / 5,925 ft)

Tanaga volcano is the second largest volcano of the central Aleutians. It is the central and highest of 3 young stratovolcanoes oriented along a roughly E-W line at the NW tip of Tanaga Island. [more info]

Uliaga

(Stratovolcano 888 m / 2,913 ft)

[more info]

Vsevidof

(Stratovolcano 2149 m / 7,050 ft)

[more info]

Westdahl

(Stratovolcano? 1654 m / 5,426 ft)

[more info]

Wide Bay

(Pyroclastic cone 640 m / 2100 ft)

[more info]

Yunaska

(Shield volcano 550 m / 1,804 ft)

[more info]

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Shishaldin Volcano (United States) activity update Sep 17, 2025 - Unrest

The United States Geological Survey - Alaska Volcano Observatory (USGS-AVO) reported that unrest continued at Shishaldin between 16 September 2025 (local) and 17 September 2025 (local). The alert level remained at "Advisory" (level 2 on a 4-level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale). Activity also included: SO2 degassing. ... Read all

Thu, 18 Sep 2025, 22:15

Great Sitkin Volcano (United States) activity update Sep 17, 2025 - Continuing eruption

The United States Geological Survey - Alaska Volcano Observatory (USGS-AVO) reported that the eruption continued at Great Sitkin between 16 September 2025 (local) and 17 September 2025 (local). Lava continued to erupt in the summit crater. The alert level remained at "Watch" (level 3 on a 4-level scale). The aviation alert level remained at "Orange" (level 3 on a 4-level scale). ... Read all