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United States · Stratovolcano

Mount Adams

Adams

Type
Stratovolcano
Elevation
3742m
Last eruption
950
Mount Adams
Photo: USGS Photo by R. Iverson, USGS/CVO · Public domain · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / High Cascades Volcanic Arc
Elevation
3742m
Coordinates
46.206, -121.490
Last eruption
950
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic andesite
Geological summary

The andesitic-dacitic Mount Adams stratovolcano is second in volume only to Mount Shasta in the Cascade Range. The volcanic complex is elongated along a NNW-SSE line, and includes more than 60 flank vents over 200 km2. Volcanism began about 940 ka, with three main cone-building stages occurring at about 500, 450, and 30 ka. It was active throughout the Holocene, producing two dozen minor explosive eruptions from summit and flank vents. Six Holocene lava flows are located on the flanks between 2,100 and 2,600 m elevation. The most voluminous Holocene lava flows, some of which traveled 10 km or more, were emplaced between about 7,000 and 4,000 years ago. The latest eruption about 1,000 years ago produced a minor tephra layer and possibly a small lava flow down the E flank.

From Wikipedia

Mount Adams is a stratovolcano located in the Cascade Range of Washington, United States. Standing at 12,276 ft (3,742 m) feet, it is the second-highest mountain in Washington and a prominent feature within the Cascade Volcanic Arc, which formed as a result of the subduction of the Juan de Fuca Plate beneath the North American Plate. Adams is near two more-frequently erupting neighbors, Mount St Helens and Mount Rainier. It has twelve named glaciers descending its slopes.

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Eruption history

15 recordedGlossary
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
7050 BCE~6783 BCE · 1 eruptions · max VEI 25183 BCE~4917 BCE · 1 eruptions · max VEI 24650 BCE~4383 BCE · 1 eruptions · max VEI 24117 BCE~3850 BCE · 1 eruptions · max VEI 23850 BCE~3583 BCE · 1 eruptions · max VEI 13583 BCE~3317 BCE · 1 eruptions · max VEI 23317 BCE~3050 BCE · 1 eruptions · max VEI 23050 BCE~2783 BCE · 1 eruptions · max VEI 12783 BCE~2517 BCE · 1 eruptions · max VEI 21983 BCE~1717 BCE · 1 eruptions · max VEI 1650 BCE~383 BCE · 2 eruptions · max VEI 2383 BCE~117 BCE · 1 eruptions · max VEI 2150~417 · 1 eruptions · max VEI 2683~950 · 1 eruptions · max VEI 27050 BCE5183 BCE3050 BCE1183 BCE683

Detailed timeline

  1. 950VEI 2Geological estimate
    950 – end unknown
    East flank?
  2. 200VEI 2Geological estimate
    200 – end unknown
  3. 300 BCEVEI 2Geological estimate
    300 BCE – end unknown
  4. 400 BCEVEI 2Geological estimate
    400 BCE – end unknown
  5. 550 BCE (±1000 yrs)VEI 2Geological estimate
    550 BCE – end unknown
  6. 1850 BCEVEI 1Geological estimate
    1850 BCE – end unknown
    SSE flank (2100 m)
  7. 2650 BCE (±300 yrs)VEI 2Geological estimate
    2650 BCE – end unknown
  8. 2950 BCE (±100 yrs)VEI 1Geological estimate
    2950 BCE – end unknown
    SSE flank (2600 m)
  9. 3250 BCE (±300 yrs)VEI 2Geological estimate
    3250 BCE – end unknown
  10. 3550 BCEVEI 2Geological estimate
    3550 BCE – end unknown
  11. 3800 BCE (±1950 yrs)VEI 1Geological estimate
    3800 BCE – end unknown
    NNE flank (2100-2250 m)
  12. 4050 BCE (±500 yrs)VEI 2Geological estimate
    4050 BCE – end unknown
    Upper SW flank?
  13. 4550 BCEVEI 2Geological estimate
    4550 BCE – end unknown
    NW flank (2200-2400 m)
  14. 5150 BCE (±500 yrs)VEI 2Geological estimate
    5150 BCE – end unknown
  15. 7050 BCE (±1000 yrs)VEI 2Geological estimate
    7050 BCE – end unknown

Nearby volcanoes

External links

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