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Cascade Range Volcanoes

Cascade Range Volcanoes. Mount Jefferson. Mt Rainier. Mt. Hood. Mt.Adams. Mt.Saint Helens. Three Sisters. Types of Volcanoes. California Volcanoes. Mount Lassen. Elevation 10,457ft. Most recent activity occurred in 1914-1917. Helen Lake. Lassen Erupts May 22, 1915. Mount Shasta.

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Cascade Range Volcanoes

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  1. Cascade Range Volcanoes Mount Jefferson Mt Rainier Mt. Hood Mt.Adams Mt.Saint Helens Three Sisters

  2. Types of Volcanoes

  3. California Volcanoes

  4. Mount Lassen • Elevation 10,457ft Most recent activity occurred in 1914-1917. Helen Lake

  5. Lassen Erupts May 22, 1915

  6. Mount Shasta 2nd Tallest Peak in the Cascades • Elevation 14,162ft Shastina Mt. Shasta debris avalanche covers an area of 450 square miles. 10 times the volume of the 1980 Mt. Saint Helens Eruption

  7. Mount Shasta and Haley’s Comet

  8. Oregon Volcanoes

  9. Crater Lake • Mt. Mazama was 10,800-12,000ft prior to collapse • Hillman Peak 8,126ft Highest point on the rim of the caldera Wizard Island. A small cinder cone volcano. • Mt. Mazama’s massive eruption created a caldera, forming Crater Lake

  10. Mount Hood Most recent eruptive activity (1760-1810 A.D.) occurred just prior to Lewis & Clark’s visit in 1805. • 11,239ft

  11. Mount Hood from Portland Mt. Hood is located 75km Southeast of Portland, Oregon

  12. Washington Volcanoes

  13. Mount Adams • 12,276ft Third Tallest Peak in the Cascades Second in eruptive volume only to Mt. Shasta

  14. Mount Rainier • 14,410ft Highest Peak in the Cascades Last large eruptions occured 1000 and 2300 years ago. Erupted as recently as the 1840’s Tacoma / Puget Sound

  15. Mount Saint Helens • Emerged from dormancy in May 1980 with a devastating eruption. • Recently became active again in September 2004

  16. The Bulge

  17. USGS geologist: Dave Johnston

  18. 9,677ft

  19. 9,677ft

  20. Highest point of crater rim: 8,364ft (1,313ft lower)

  21. Pyroclastic Flows Super-heated gases mixed with fine ash, cinders and volcanic bombs rush down the slopes of Mt. Saint Helens in the days following the large eruption.

  22. David Johnston’s last know location

  23. Before and After

  24. May 18, 1980: Ashfall in downtown Yakima, WA

  25. Smith Creek

  26. Logging Mill on the Banks of the North Fork Toutle River

  27. Pumice PlainTributaries to NF of Toutle Creek 1980 2004 *Note evidence of erosion taking place on the pumice plain

  28. Creeks needed to downcut through the ash and pumice. Mudd River

  29. Mt. Shasta Mt. Saint Helens

  30. Cubic Kilometers of Ejecta from Historic Eruptions

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