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Mount Shasta

Shasta

Stratovolcano · United States · 4317m

Mount Shasta in northern California, seen here from the SE, is one of the largest of the Cascades volcanoes and is constructed of at least four overlapping edifices. Hotlum cone (forming the summit), along with the Shastina and Black Buttes lava domes, were all constructed during the Holocene.
Mount Shasta in northern California, seen here from the SE, is one of the largest of the Cascades volcanoes and is constructed of at least four overlapping edifices. Hotlum cone (forming the summit), along with the Shastina and Black Buttes lava domes, were all constructed during the Holocene. · Photo: Photo by Lyn Topinka, 1984 (U.S. Geological Survey). · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America Volcanic Regions / 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.

From Wikipedia

Mount Shasta is a potentially active stratovolcano at the southern end of the Cascade Range in Siskiyou County, California. At an elevation of 14,179 ft (4,322 m), it is the second-highest peak in the Cascades and the fifth-highest in the state. Mount Shasta has an estimated volume of 85 cubic miles, which makes it the most voluminous stratovolcano in the Cascade Volcanic Arc. The mountain and surrounding area are part of the Shasta–Trinity National Forest.

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Eruption history

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

External links

⚠ For reference only. Not for emergency response.