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United States · Stratovolcano

Seguam Island

Seguam

Type
Stratovolcano
Elevation
1054m
Last eruption
1993
Seguam Island
Photo: NASA · Public domain · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / Aleutian Ridge Volcanic Arc
Elevation
1054m
Coordinates
52.315, -172.510
Last eruption
1993
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Andesite / Basaltic andesite

Geological summary

The 11.5 x 24 km island of Seguam, between Amlia and Amukta Islands in the central Aleutians, contains two calderas with Holocene post-caldera cones.

Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →

From Wikipedia

Seguam Island is a small volcanic island in the Andreanof Islands group in the Aleutian Islands of Alaska. The island is mountainous and oval shaped with a land area of 80.04 square miles (207.3 km2). It is 16 miles (26 km) long and 6.8 miles (10.9 km) wide.

Wikipedia · CC BY-SA · Read full article →

Eruption history

13 recordedGlossary

Record summary

Confirmed eruptions
11
Uncertain eruptions
2
Span of confirmed record
7300 BCE (±2250 yrs) – 1993
Largest confirmed eruption
VEI 5 (7300 BCE)
Confirmed eruptions since 1900
4
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
7300 BCE~6990 BCE · 1 eruptions · max VEI 55132 BCE~4822 BCE · 1 eruptions · max VEI 04202 BCE~3893 BCE · 1 eruptions · max VEI 0134~444 · 1 eruptions · max VEI ?1683~1993 · 9 eruptions · max VEI 37300 BCE5132 BCE2653 BCE485 BCE1683

Detailed timeline

  1. 1993VEI 2Observed
    1993-05-28 – 1993-08-31
    Near Pyre Peak
  2. 1992VEI 2Observed
    1992-12-27 – 1992-12-30
    Pyre Peak (1.5 km south of summit)
  3. 1977VEI 1Observed
    1977-03-06 – 1977-03-08
    Pyre Peak (2.5 km SE of summit)
  4. 1927VEI ?Method not stated
    1927-07-02 – end unknown
  5. 1902VEI 3Observed
    1902-07-02 – end unknown
  6. 1892VEI 3Observed
    1892-04-15 – end unknown
  7. 1891VEI 2Observed
    1891-12-16 – end unknown
  8. 1827VEI ?Method not stated
    1827-07-02 – end unknown
  9. 1786VEI ?Observed
    1786 – 1790
  10. 250 (±500 yrs)VEI ?Geological estimate
    250 – end unknown
    West of Wilcox volcano
  11. 4050 BCE (±4000 yrs)VEI 0Geological estimate
    4050 BCE – end unknown
    W flank of cone in eastern caldera
  12. 5100 BCE (±2000 yrs)VEI 0Geological estimate
    5100 BCE – end unknown
    W flank of cone in eastern caldera
  13. 7300 BCE (±2250 yrs)VEI 5Geological estimate
    7300 BCE – end unknown
    Wilcox volcano

Nearby volcanoes

External links

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