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Trident Volcano

Trident

Stratovolcano · United States · 1864m

Trident, seen here from Baked Mountain to its NW, was initially named for its three prominent summits. A series of eruptions from 1953 until 1968 constructed a fourth cone, which forms the smoother peak to the right. As many as 23 lava domes are found in the Trident volcanic complex. The 1912 Novarupta lava dome is visible to the lower center.
Trident, seen here from Baked Mountain to its NW, was initially named for its three prominent summits. A series of eruptions from 1953 until 1968 constructed a fourth cone, which forms the smoother peak to the right. As many as 23 lava domes are found in the Trident volcanic complex. The 1912 Novarupta lava dome is visible to the lower center. · Photo: Photo by Game McGimsey (U.S. Geological Survey, Alaska Volcano Observatory). · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America Volcanic Regions / Alaska Peninsula Volcanic Arc
Elevation
1864m
Coordinates
58.236, -155.100
Last eruption
1974
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The Trident stratovolcano cluster was named for the three prominent peaks that were the most visible features at the summit prior to 1953. The andesitic-dacitic group consists of four overlapping stratovolcanoes and numerous flank lava domes, including Falling Mountain and Mt. Cerberus on the far west flank. The summit complex is located 3-5 km SE of Novarupta volcano, and merges along a ridge to the NE with Katmai. The three oldest Trident volcanoes are glaciated and Pleistocene in age, while the youngest, Southwest Trident, was formed during historical time. Eruptions migrated through time from the NE to the SW. In 1953 a new lava dome began growing on the SW flank of Trident I volcano. A series of thick andesitic lava flows were erupted between 1953 and 1968, forming a cone with 400-800 m of local relief. Periodic explosions took place until 1974, and the current summit contains a 350-m-wide crater. Some of the distal lava flows from West Trident stratovolcano collapsed into the Novarupta vent during its 1912 eruption.

From Wikipedia

Trident Volcano is an eroded volcanic complex on the Alaska Peninsula in Katmai National Park, Alaska. Up to 23 domes comprise the complex stratovolcano, with the greatest elevation of 6,115 feet (1,864 m). The most recent major activity produced a 3,599-foot (1,097 m) dome in an amphitheater on the southwest flank of the southwest peak. Volcano Novarupta formed on its slopes in the largest volcanic eruption of the 20th century.

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Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1913~1919 · 1 eruptions · max VEI 11944~1950 · 1 eruptions · max VEI ?1950~1956 · 2 eruptions · max VEI 31956~1962 · 3 eruptions · max VEI 21962~1968 · 6 eruptions · max VEI 31968~1974 · 2 eruptions · max VEI 319131925194419561968

Detailed timeline

  1. 1974VEI 3Observed
    1974-07-15 – Ongoing
    SW flank
  2. 1968VEI 3Observed
    1968-11-13 – 1968-11-13
    SW flank
  3. 1967VEI 3Observed
    1967-09-05 – 1968-02-25
    SW flank
  4. 1966VEI 0Observed
    1966-07-02 – Ongoing
    SW flank
  5. 1964VEI 3Observed
    1964-05-31 – Ongoing
    SW flank
  6. 1963VEI 3Observed
    1963-04-01 – 1963-04-03
    SW flank
  7. 1963VEI 3Observed
    1963-10-17 – 1963-11-17
    SW flank
  8. 1962VEI 3Observed
    1962-06-09 – 1962-06-09
    SW flank
  9. 1961VEI 2Observed
    1961-06-30 – Ongoing
    SW flank (1100 m)
  10. 1957VEI 2Observed
    1957-07-02 – 1960-08-10
    SW flank
  11. 1956VEI 2Geological estimate
    1956-09-08 – 1956-09-09
    Volcano Uncertain: attributed to Trident
  12. 1953VEI 3Observed
    1953-02-15 – 1954-10-05
    SW flank (1100 m)
  13. 1950VEI 2Geological estimate
    1950-07-02 – 1950-08-18
    Volcano Uncertain: attributed to Trident
  14. 1949VEI ?Observed
    1949-06 – Ongoing
  15. 1913VEI 1Observed
    1913-09 – Ongoing

External links

⚠ For reference only. Not for emergency response.