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Edgecumbe

Photo of this volcano
  • Country
  • Primary Volcano Type
  • Last Known Eruption
  •  
  • 57.05°N
  • 135.75°W

  • 970 m
    3182 ft

  • 315040
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number
Most Recent Weekly Report: 20 April-26 April 2022 Citation IconCite this Report

AVO stated that a seismic swarm beneath Kruzof Island near Edgecumbe that began at about 0200 on 11 April had declined to background levels by 22 April. The swarm prompted an in-depth analysis of satellite data which spanned the last 7.5 years. The data showed that a broad area of uplift, about 17 km in diameter, was located about 2.5 km E of Edgecumbe. The uplift began in August 2018 and deformed at a rate of up to 8.7 cm per year in the center of the area, totaling 27 cm of uplift; the deformation was ongoing. Retrospective analysis of seismic data revealed that earthquakes started occurring in 2020, though the recent swarm was unusual. The deformation and seismic data together suggested magma movement beneath the volcano, consistent with an intrusion at about 5 km below sea level. The closest seismic station to the volcano was on Sitka, 24 km E; both the Volcano Alert Level and Aviation Color Code remained at Unassigned due to the lack of dedicated, local instrumentation.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Weekly Reports - Index


2022: April


20 April-26 April 2022 Citation IconCite this Report

AVO stated that a seismic swarm beneath Kruzof Island near Edgecumbe that began at about 0200 on 11 April had declined to background levels by 22 April. The swarm prompted an in-depth analysis of satellite data which spanned the last 7.5 years. The data showed that a broad area of uplift, about 17 km in diameter, was located about 2.5 km E of Edgecumbe. The uplift began in August 2018 and deformed at a rate of up to 8.7 cm per year in the center of the area, totaling 27 cm of uplift; the deformation was ongoing. Retrospective analysis of seismic data revealed that earthquakes started occurring in 2020, though the recent swarm was unusual. The deformation and seismic data together suggested magma movement beneath the volcano, consistent with an intrusion at about 5 km below sea level. The closest seismic station to the volcano was on Sitka, 24 km E; both the Volcano Alert Level and Aviation Color Code remained at Unassigned due to the lack of dedicated, local instrumentation.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


13 April-19 April 2022 Citation IconCite this Report

AVO stated that a seismic swarm beneath Kruzof Island near Edgecumbe began at about 0200 on 11 April, and by 15 April several hundred earthquakes had been recorded. The number of events was unusual for that volcano. The magnitudes were generally M 1.7 or smaller, though a M 2.8 was detected on 11 April. The events were located at depths of less than 10 km, though the exact locations were difficult to constrain due to the lack of a local seismic network on the island; the closest station was in Sitka, 25 km E. The source of the swarm was unknown, and related either to tectonic processes or volcanic unrest, or a combination of both. Both the Volcano Alert Level and Aviation Color Code were Unassigned due to the lack of dedicated, local instrumentation. AVO noted that additional data from distant seismic stations was being analyzed, and several years of Synthetic Aperture Radar (SAR) data was being evaluated for topographical changes. No surficial changes were visible in recent satellite images and webcams views.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


The Global Volcanism Program has no Bulletin Reports available for Edgecumbe.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 4 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2360 BCE ± 140 years 2080 BCE ± 90 years Confirmed   Isotopic: 14C (uncalibrated) Edgecumbe Second Mid-Holocene Rhyolitic Ash
3810 BCE ± 70 years Unknown Confirmed   Isotopic: 14C (uncalibrated) Edgecumbe Mid-Holocene Rhyolitic Tephra
7215 BCE ± 165 years Unknown Confirmed   Isotopic: 14C (uncalibrated) Edgecumbe CFE
9300 BCE ± 50 years Unknown Confirmed   Isotopic: 14C (uncalibrated) Edgecumbe Tephra set (includes Mount Edgecumbe Dacite (MEd) Tephra)
Deformation History

There is no Deformation History data available for Edgecumbe.

Emission History

There is no Emissions History data available for Edgecumbe.

GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Canada, United States
Publisher: DMA Aerospace Center
Country: United States, Canada
Year: 1989
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of Canada, United States

Title: Jet Navigation Chart AK/ Canada
Publisher: DMA Aerospace Center
Country: United States, Canada
Year: 1983
Series: JNC
Map Type: Navigation
Scale: 1:2,000,000
Map of Jet Navigation Chart AK/ Canada

Title: British Columbia Geol Highway Map (4)
Publisher: Ministry of Energy, Mines & Petroleum Resources
Country: Canada
Year: 1981
Series: BC Geol Maps
Map Type: Geology
Scale: 1:2,500,000
Map of British Columbia Geol Highway Map (4)

Title: Port Alexander
Publisher: US Geological Survey
Country: United States
Year: 1977
Series: AK Topo 250
Map Type: Topographic
Scale: 1:250,000
Map of Port Alexander

Title: Port Alexander (D-4)
Publisher: US Geological Survey
Country: United States
Year: 1977
Series: 63,360 Topo
Map Type: Topographic
Scale: 1:63,360
Map of Port Alexander (D-4)

Title: Sitka (A-4)
Publisher: US Geological Survey
Country: United States
Year: 1975
Series: 63,360 Topo
Map Type: Topographic
Scale: 1:63,360
Map of Sitka (A-4)

Title: Sitka
Publisher: US Geological Survey
Country: United States
Year: 1970
Series: AK Topo 250
Map Type: Topographic
Scale: 1:250,000
Map of Sitka
Smithsonian Sample Collections Database

There are no samples for Edgecumbe in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites