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Edgecumbe volcano

Updated: Jun 5, 2023 23:02 GMT -
Stratovolcanoes 970 m / 3,182 ft
United States, Eastern Alaska, 57.05°N / -135.75°W
Current status: normal or dormant (1 out of 5)
Last update: 25 Feb 2023 (seismic swarm continues)
Mt. Edgecumbe volcano Sitka, AK (image taken by Fate Xalis)
Mt. Edgecumbe volcano Sitka, AK (image taken by Fate Xalis)

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Typical eruption style: unspecified
Edgecumbe volcano eruptions: 2220 BC +-100 years

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Wednesday, May 31, 2023 GMT (3 quakes)
May 31, 2023 4:22 am (GMT -8) (May 31, 2023 12:22 GMT)

1.3 km
13 km (8.1 mi)
22 Km WNW of Sitka, Alaska
May 30, 2023 6:55 pm (GMT -8) (May 31, 2023 02:55 GMT)

0.7 km
11 km (6.8 mi)
15 mi northwest of Sitka, Alaska, USA
May 31, 2023 02:06 GMT

5 km
13 km (8.1 mi)
North Pacific Ocean, 23 mi west of Sitka, Alaska, USA
Tuesday, May 30, 2023 GMT (2 quakes)
May 30, 2023 23:55 GMT

5 km
11 km (6.8 mi)
15 mi northwest of Sitka, Alaska, USA
May 30, 2023 3:35 pm (GMT -8) (May 30, 2023 23:35 GMT)

5 km
9.7 km (6 mi)
North Pacific Ocean, 19 mi west of Sitka, Alaska, USA


The Pleistocene-to-Holocene Mount Edgecumbe volcanic field covers about 260 sq km of Kruzov Island west of Sitka in the SE panhandle of Alaska. The basaltic-to-dacitic field is dominated by the large composite cones of Mount Edgecumbe, Crater Ridge, and Shell Mountain and has an unusual tectonic setting only 16 km east of the Queen Charlotte-Fairweather transform fault separating the North American and Pacific plates. Mount Edgecumbe, a 970-m-high stratovolcano with a well-defined crater, is the largest volcano of the Edgecumbe field. Crater Ridge is truncated by a 1.6-km-wide, 240-m-deep caldera. These and other vents of the volcanic field are oriented along a SW-NE line. Volcanic activity originated about 600,000 years ago along fissures cutting Kruzof Island. A series of major silicic explosive eruptions took place about 9000-13,000 radiocarbon years ago. The latest dated eruptions were phreatomagmatic explosions during the mid-Holocene, and all postglacial activity has been pyroclastic. Reports of historical eruptions of Mount Edgecumbe are unsubstantiated.
Smithsonian / GVP volcano information

See also: Sentinel hub | Landsat 8 | NASA FIRMS
Sat, 25 Feb 2023, 15:53

Edgecumbe volcano (Eastern Alaska,United States): seismic swarm continues

Lower panel in inset shows earthquake focal depth versus time from 2010 to the present with blue symbols for from 2020 through 2021 and red symbols since 2021 (image: AVO)
The low-level seismic unrest at the volcano continues. ... Read all
Fri, 29 Apr 2022, 07:03

Edgecumbe (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 20 April-26 April 2022 (NEW)

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. ... Read all
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