Fisher Volcano
Updated: Nov 29, 2025 08:38 GMT -
Stratovolcano
United States, Aleutian Islands, 54.65°N / -164.43°W 
Summit height: 1112 m / 3,648 ft
Current status: normal or dormant (1 out of 5)
[smaller] [larger]
Fisher volcano eruptions: 1830
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
| Nov 27, 08:09 pm (Universal Time) | 0.7 1.8 km | 29 km (18 mi) to the E | 40 km WSW of False Pass, Alaska | Info | |
| Wednesday, November 26, 2025 GMT (1 quake) | |||||
| Nov 26, 11:45 am (Universal Time) | 1.0 5.7 km | 29 km (18 mi) to the NE | 40 km WSW of False Pass, Alaska | Info | |
| Monday, November 24, 2025 GMT (6 quakes) | |||||
| Nov 24, 10:46 pm (Universal Time) | 1.1 0.7 km | 30 km (18 mi) to the NE | 39 km WSW of False Pass, Alaska | Info | |
| Nov 24, 10:18 pm (Universal Time) | 1.4 2.6 km | 28 km (18 mi) to the E | 40 km WSW of False Pass, Alaska | Info | |
| Nov 24, 07:44 pm (Universal Time) | 1.4 9.9 km | 24 km (15 mi) to the E | 46 km WSW of False Pass, Alaska | Info | |
| Nov 24, 07:18 pm (Universal Time) | 1.5 14 km | 25 km (16 mi) to the E | 44 km WSW of False Pass, Alaska | Info | |
| Nov 24, 06:55 am (GMT -9) | 1.3 10.8 km | 27 km (17 mi) to the E | 42 km WSW of False Pass, Alaska | Info | |
| Nov 24, 12:45 pm (Universal Time) | 1.4 2 km | 22 km (14 mi) to the SW | 82 km ENE of Akutan, Alaska | Info | |
| Friday, November 21, 2025 GMT (1 quake) | |||||
| Nov 21, 01:31 am (GMT -9) | 1.7 8.6 km | 22 km (14 mi) to the NE | 49 km W of False Pass, Alaska | Info | |
Background
The 11 x 18 km Fisher caldera on western Unimak Island NE of Westdahl volcano is one of the largest calderas in the Aleutian arc. The caldera, which is elongated in a NE direction, formed around 9400 years ago, accompanied by emission of large-volume, mobile pyroclastic flows that reached the Bering Sea and the Pacific Ocean. Two satellitic cones are located below the north rim, NE of its 1112-m high point at Eickelberg Peak, which rises more than 900 m above three lakes on the caldera floor, one of which drains through a notch in the southern caldera rim. A large composite cone, Mount Finch, is found at the center of the caldera, which also contains a small breached cinder cone. Historical eruptions have occurred in the 18th and 19th centuries. Low-temperature fumaroles are located at the western flank of Mount Finch, and Turquoise Lake, at the base of the cone, emits hydrogen sulfide gas.---
Smithsonian / GVP volcano information
Fisher Volcano Photos
Wild sea and the fisher houses at Klima (Photo: Tom Pfeiffer)
Fishermen at the coast of Rakata island. (Photo: Tobias Schorr)
Fishermen at Rakata island (Photo: Tobias Schorr)
Indonesian fishermen at the coast of Rakata island (Photo: Tobias Schorr)
Significant volcanic eruptions: Fisher volcano
In the past 10,000 years, Fisher has had at least 6 confirmed volcanic eruptions, out of which 3 are documented by historical records, while the others can be inferred from geological evidence.
The table below lists all known eruptions (date in bold face) of Fisher volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Fisher can be found on the news page of Fisher volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
| Mount Finch Historical obs./docs. | 2? | ||||
| Mount Finch Historical obs./docs. | 3 | ||||
Historical obs./docs. | ? | ||||
| Turquoise cone | ? | ||||
| Turquoise cone | 5 | ||||
| NE and SW parts of Fisher caldera | 6? | ||||
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
Fisher Volcano FAQ
+When was the last eruption of Fisher volcano?
The last confirmed eruption of Fisher occurred in 1830.
+How often does Fisher volcano erupt?
Since 1795, Fisher volcano has had at least 3 historically documented eruptions. This means that it erupts on average every 77 years.
Many eruptions of Fisher have lasted more than one year. In total, the volcano has been in eruption during 4 out of 230 years until now. In other words, Fisher has been active at least one in 57.5 years on average. Note that this value is likely an underestimate, because the known history of eruptions from Fisher is likely incomplete, especially further back in time.
+When was the largest eruption of Fisher volcano?
The largest eruption known from the younger geological history of Fisher volcano occurred around 7420 BC. It ranks as a "vulcanian" eruption with a magnitude 3 on the VEI (Volcanic Explosivity Index) scale.
Latest satellite images
Fisher 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 Fisher volcano (world scale)
Terrain-type map of Fisher volcano (world scale)
Satellite/aerial-type map of Fisher volcano (region scale large)
Terrain-type map of Fisher volcano (region scale large)
Satellite/aerial-type map of Fisher volcano (region scale medium)
Terrain-type map of Fisher volcano (region scale medium)
Satellite/aerial-type map of Fisher volcano (region scale small)
Terrain-type map of Fisher volcano (region scale small)
Satellite/aerial-type map of Fisher volcano (local scale large)
Terrain-type map of Fisher volcano (local scale large)
Satellite/aerial-type map of Fisher volcano (local scale medium)
Terrain-type map of Fisher volcano (local scale medium)
Satellite/aerial-type map of Fisher volcano (local scale small)
Terrain-type map of Fisher volcano (local scale small)
Satellite/aerial-type map of Fisher volcano (scale of 10s of km)
Terrain-type map of Fisher volcano (scale of 10s of km)
Satellite/aerial-type map of Fisher volcano (scale of 20-40 km)
Terrain-type map of Fisher volcano (scale of 20-40 km)
Satellite/aerial-type map of Fisher volcano (scale of approx. 10-20 km)
Terrain-type map of Fisher volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Fisher volcano (scale of 5-10 km)
Satellite/aerial-type map of Fisher volcano (scale of few kilometers)
