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United States · Stratovolcano

Mount Shasta

Shasta

Type
Stratovolcano
Elevation
4317m
Last eruption
1250
Mount Shasta
Photo: Frank Schulenburg · CC BY-SA 4.0 · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / High Cascades Volcanic Arc
Elevation
4317m
Coordinates
41.409, -122.193
Last eruption
1250
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic andesite
Geological summary

The most voluminous of the Cascade volcanoes, northern California's Mount Shasta is a massive compound stratovolcano composed of at least four main edifices constructed over a period of at least 590,000 years. An older edifice was destroyed by a large debris avalanche which filled the Shasta River valley to the NW. The Hotlum cone, forming the present summit, the Shastina lava dome complex, and the SW flank Black Butte lava dome, were constructed during the early Holocene. Eruptions from these vents have produced pyroclastic flows and mudflows that affected areas as far as 20 km from the summit. Eruptions from Hotlum cone continued throughout the Holocene.

Eruption history

22 recordedGlossary
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
8050 BCE~7740 BCE · 2 eruptions · max VEI ?7740 BCE~7430 BCE · 1 eruptions · max VEI 47430 BCE~7120 BCE · 3 eruptions · max VEI 06810 BCE~6500 BCE · 1 eruptions · max VEI ?6190 BCE~5880 BCE · 1 eruptions · max VEI ?4330 BCE~4020 BCE · 1 eruptions · max VEI ?3090 BCE~2780 BCE · 1 eruptions · max VEI 02780 BCE~2470 BCE · 1 eruptions · max VEI ?2160 BCE~1850 BCE · 1 eruptions · max VEI ?1230 BCE~920 BCE · 1 eruptions · max VEI ?920 BCE~610 BCE · 2 eruptions · max VEI ?610 BCE~300 BCE · 1 eruptions · max VEI ?300 BCE~10 · 1 eruptions · max VEI ?10~320 · 2 eruptions · max VEI 0630~940 · 1 eruptions · max VEI ?940~1250 · 2 eruptions · max VEI ?8050 BCE5880 BCE3400 BCE1230 BCE940

Detailed timeline

  1. 1250VEI ?Geological estimate
    1250 – end unknown
  2. 1200VEI ?Geological estimate
    1200 – end unknown
  3. 850VEI ?Geological estimate
    850 – end unknown
  4. 150VEI ?Geological estimate
    150 – end unknown
  5. 50VEI 0Geological estimate
    50 – end unknown
  6. 150 BCEVEI ?Geological estimate
    150 BCE – end unknown
  7. 550 BCE (±500 yrs)VEI ?Geological estimate
    550 BCE – end unknown
  8. 650 BCE (±800 yrs)VEI ?Geological estimate
    650 BCE – end unknown
  9. 850 BCEVEI ?Geological estimate
    850 BCE – end unknown
  10. 1150 BCEVEI ?Geological estimate
    1150 BCE – end unknown
  11. 2050 BCEVEI ?Geological estimate
    2050 BCE – end unknown
  12. 2550 BCEVEI ?Geological estimate
    2550 BCE – end unknown
  13. 3050 BCE (±1000 yrs)VEI 0Geological estimate
    3050 BCE – end unknown
  14. 4050 BCEVEI ?Geological estimate
    4050 BCE – end unknown
  15. 6050 BCEVEI ?Geological estimate
    6050 BCE – end unknown
  16. 6650 BCEVEI ?Geological estimate
    6650 BCE – end unknown
  17. 7250 BCEVEI ?Geological estimate
    7250 BCE – end unknown
  18. 7350 BCEVEI 0Geological estimate
    7350 BCE – end unknown
    Summit, north and west flanks
  19. 7420 BCE (±300 yrs)VEI ?Geological estimate
    7420 BCE – end unknown
    Shastina and Black Butte
  20. 7650 BCE (±100 yrs)VEI 4Geological estimate
    7650 BCE – end unknown
    Summit, S flank (Red Banks), and Shastina
  21. 7750 BCEVEI ?Geological estimate
    7750 BCE – end unknown
  22. 8050 BCEVEI ?Geological estimate
    8050 BCE – end unknown

Nearby volcanoes

External links

⚠ For reference only. Not for emergency response.