High Cascades

Modern Volcanoes of the Pacific NW

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Mt. St. Helens, July 27, 2005

Volcanic Episodes

65

55

45

35

25

15

0

5

Age (Myrs)

WesternCascade Arc(37-15 Myrs)

Challis Arc(55-42 Myrs)

High Cascade Arc(5-0 Myrs)

Columbia River Basalts(17-6 Myrs,Most 17-14 Myrs)

Yellowstone Hot Spot(14-0 Myrs)

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West &High Cascades

G-1

West Cascade Arc(37-15 Myrs)

High Cascade Arc(5-0 Myrs)

Cascade Volcanoes

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G-1

Why Do Cascade Volcanoes Exist at All?

Subduction

Cascade Eruptions 4000yrs

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Historic Cascade EruptionsG-4

Cascade Volcanoes

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G-1

Mt BakerQuickTime™ and aTIFF (Uncompressed) decompressor

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Glacier PeakQuickTime™ and a

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Glacier Peak Ash Fall

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13,100 yr tephra - in inches

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Mt. St. Helens

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April 1980

1980 Eruption - Ash Cloud

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1980 EruptionQuickTime™ and a

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Damage

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Blast / Pyroclastic FlowQuickTime™ and a

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Lahars

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2004-6 Eruption

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October 1, 2004

2005 Dome

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81 Million Cubic Meters as of April, 2006

2005 Dome

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February 22, 2005

July 27, 2006

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Feb, 2005

Current Dome Growth

Thermal Image - July 27, 2006

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Time-lapse animation

June 29, 2006

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