Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Westdahl
The summit area of Westdahl volcano, located on the southwestern part of Unimak Island in the eastern Aleutians, is seen here from the east. Westdahl Peak (left) and Faris Peak (right) cap the broad Westdahl stratovolcano. The cinder cone at the middle right marks the principal eruption site for the 1991-92 activity. Note the snow-mantled lava flow emanating from the cinder cone. The sinuous fissure cutting across the glacial icecap from the summit formed in the opening phases of the eruption and was the location of spectacular lava fountaining. Photo by C.F. Zeillemaker, 1993 (U.S. Fish and Wildlife Service, courtesy of Alaska Volcano Observatory).
Volcano Number:311340
Volcano Name:Westdahl
Country:United States
Volcano Type:Stratovolcano?
Last Eruption:1992 CE
Elevation:1563m
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:0
Pop. within 10km:0
Pop. within 30km:0
Pop. within 100km:305
Latitude:54.516
Longitude:-164.65



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
311340 Westdahl 20039 Confirmed Eruption 4 Pogromni or (more likely) Westdahl Historical Observations 1795
311340 Westdahl 20040 Confirmed Eruption 0 Pogromni or (more likely) Westdahl Historical Observations 1796
311340 Westdahl 20041 Confirmed Eruption 2 Pogromni or (more likely) Westdahl Historical Observations 1820
311340 Westdahl 20042 Confirmed Eruption 2 Pogromni or (more likely) Westdahl Historical Observations 1827 1830
311340 Westdahl 20043 Confirmed Eruption 2 Historical Observations 1964/3/10 1964/4/16
311340 Westdahl 20044 Confirmed Eruption 3 South of Westdahl Peak (1450 m) Historical Observations 1978/2/4 1978/2/9
311340 Westdahl 20045 Uncertain Eruption 3 ? 1979/2/8 1979/2/9
311340 Westdahl 20046 Confirmed Eruption 3 ENE flank (1560-760 m) Historical Observations 1991/11/29 1992/1/14
Emissions Data from the Global Volcanism Program of the Smithsonian Institution
Sorry. No emissions data found for this volcano.


Data from the Earthchem Library
Title Author Release Date DOI Link
Field Report for the Collection of Mafic Tephra from the Aleutians Islands between Unimak and the Island of Four Mountains (Alaska, USA) Plank, Terry 2020-06-23 10.26022/IEDA/111584 Details
Bulk rock data for the central-eastern Aleutian volcanoes Rasmussen, Daniel 2021-02-09 10.26022/IEDA/111870 Details
Melt inclusion olivine-host data for the central-eastern Aleutian volcanoes Rasmussen, Daniel 2021-02-09 10.26022/IEDA/111871 Details
Melt inclusion data for the central-eastern Aleutian volcanoes Rasmussen, Daniel 2021-02-09 10.26022/IEDA/111873 Details
Data from the Earthchem Portal


Data from the SESAR Database


Data from the MaGa Database
Sorry. No data exist for this volcano in the MaGa database.