Yunaska Volcano
Updated: Apr 30, 2025 02:39 GMT -
Shield volcano
United States, Aleutian Islands, 52.64°N / -170.63°W 
Summit height: 550 m / 1,804 ft
Current status: normal or dormant (1 out of 5)
[smaller] [larger]
Yunaska volcano eruptions: 1937
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
Background
The elongated, 9 x 23 km island of Yunaska in the Islands of the Four Mountains group is comprised of two unnamed volcanic centers of greatly different morphology. The older, 950-m-high western center consists of the eroded remnants of four overlapping stratovolcanoes that form a linear, NNE-trending ridge. Cinder cones and fissure-fed lava flows extend from the western end of the complex. The younger, 550-m-high eastern complex consists of a shield volcano capped by two nested calderas. The 3.5-km-wide Coats caldera is located within an older 10 x 13 km caldera and contains cinder cones and a lava field. Two areas of particularly youthful lava flows extend down the flank through a gap in the SW caldera rim and blanket the upper northern flank of the caldera. Vents are found on the flanks of the caldera within a kilometer of its rim. A post-caldera cone is capped by a small summit crater. The eastern center is presumably the source of the island's historical eruptions, first recorded in 1817.---
Smithsonian / GVP volcano information
Significant volcanic eruptions: Yunaska volcano
In the past 10,000 years, Yunaska has had at least 3 confirmed eruptions, all documented by historical records or observations.
Additionally, there are 3 uncertain or discredited eruptions from Yunaska volcano.
Additionally, there are 3 uncertain or discredited eruptions from Yunaska volcano.
The table below lists all known eruptions (date in bold face) of Yunaska volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Yunaska can be found on the news page of Yunaska volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
Historical obs./docs. | 3 | ||||
?? | Uncertain Eruption | ? | |||
?? | Uncertain Eruption | 2? | |||
Historical obs./docs. | 2 | ||||
Historical obs./docs. | 3 | ||||
?? | Uncertain Eruption | ? | |||
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
Yunaska Volcano FAQ
+When was the last eruption of Yunaska volcano?
The last confirmed eruption of Yunaska occurred in 1937.
+How often does Yunaska volcano erupt?
Since 1824, Yunaska volcano has had at least 3 historically documented eruptions. This means that it erupts on average every 67 years.
+How active is Yunaska volcano at present?
Yunaska volcano is occasionally active: Since 1900, it has had one eruption, which occurred in 1937.
+When was the largest eruption of Yunaska volcano?
The largest eruption of Yunaska volcano in historic times occurred in 1937. It ranks as a "vulcanian" eruption with a magnitude 3 on the VEI (Volcanic Explosivity Index) scale.
Latest satellite images
Yunaska Volcano Maps
Below is a selection of maps showing the location and surroundings of the volcano at various resolutions based on aerial-imagery / terrain maps. Feel free to use them for non-commercial purposes on your blog or website as long as you credit them with a link back to this page (click to copy it).
Satellite/aerial-type map of Yunaska volcano (world scale)
Terrain-type map of Yunaska volcano (world scale)
Satellite/aerial-type map of Yunaska volcano (region scale large)
Terrain-type map of Yunaska volcano (region scale large)
Satellite/aerial-type map of Yunaska volcano (region scale medium)
Terrain-type map of Yunaska volcano (region scale medium)
Satellite/aerial-type map of Yunaska volcano (region scale small)
Terrain-type map of Yunaska volcano (region scale small)
Satellite/aerial-type map of Yunaska volcano (local scale large)
Terrain-type map of Yunaska volcano (local scale large)
Satellite/aerial-type map of Yunaska volcano (local scale medium)
Terrain-type map of Yunaska volcano (local scale medium)
Satellite/aerial-type map of Yunaska volcano (local scale small)
Terrain-type map of Yunaska volcano (local scale small)
Satellite/aerial-type map of Yunaska volcano (scale of 10s of km)
Terrain-type map of Yunaska volcano (scale of 10s of km)
Satellite/aerial-type map of Yunaska volcano (scale of 20-40 km)
Terrain-type map of Yunaska volcano (scale of 20-40 km)
Satellite/aerial-type map of Yunaska volcano (scale of approx. 10-20 km)
Terrain-type map of Yunaska volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Yunaska volcano (scale of 5-10 km)
Satellite/aerial-type map of Yunaska volcano (scale of few kilometers)
