Cascade Range Volcanoes
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Transcript of Cascade Range Volcanoes
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Cascade Range Volcanoes
Three Sisters
Mount JeffersonMt. HoodMt.AdamsMt.Saint Helens Mt Rainier
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Types of Volcanoes
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California Volcanoes
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Mount Lassen
Helen Lake
• Elevation 10,457ft
Most recent activity occurred in 1914-1917.
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Lassen Erupts May 22, 1915
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Mount Shasta
Shastina
• Elevation 14,162ft
Mt. Shasta debris avalanche covers an area of 450 square miles.
10 times the volume of the 1980 Mt. Saint Helens Eruption
2nd Tallest Peak in the Cascades
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Mount Shasta and Haley’s Comet
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Oregon Volcanoes
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Crater Lake
Wizard Island. A small cinder cone volcano.
•Mt. Mazama’s massive eruption created a caldera, forming Crater Lake
•Hillman Peak 8,126ft Highest point on the rim of the caldera
•Mt. Mazama was 10,800-12,000ft prior to collapse
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Mount Hood
• 11,239ft
Most recent eruptive activity (1760-1810 A.D.) occurred just prior to Lewis &
Clark’s visit in 1805.
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Mount Hood from Portland
Mt. Hood is located 75km Southeast of Portland, Oregon
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Washington Volcanoes
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Mount Adams
• 12,276ft
Second in eruptive volume only to Mt. Shasta
Third Tallest Peak in the Cascades
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Mount Rainier
• 14,410ft
Highest Peak in the Cascades
Erupted as recently as the 1840’s
Last large eruptions occured 1000 and 2300 years ago.
Tacoma / Puget Sound
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Mount Saint Helens
•Emerged from dormancy in May 1980 with a devastating eruption.
•Recently became active again in September 2004
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The Bulge
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USGS geologist: Dave Johnston
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• 9,677ft
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• 9,677ft
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• Highest point of crater rim: 8,364ft (1,313ft lower)
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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.
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•David Johnston’s last know location
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Before and After
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May 18, 1980: Ashfall in downtown Yakima, WA
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Smith Creek
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Logging Mill on the Banks of the North Fork Toutle River
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Pumice PlainTributaries to NF of Toutle Creek
1980
2004
*Note evidence of erosion taking place on the pumice plain
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Mudd River
Creeks needed to downcut through the ash and pumice.
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Mt. Shasta Mt. Saint Helens
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Cubic Kilometers of Ejecta from Historic Eruptions