High Cascades Modern Volcanoes of the Pacific NW Mt. St. Helens, July 27, 2005.

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Presentation transcript:

High Cascades Modern Volcanoes of the Pacific NW Mt. St. Helens, July 27, 2005

Volcanic Episodes Age (Myrs) Western Cascade Arc (37-15 Myrs) Challis Arc (55-42 Myrs) High Cascade Arc (5-0 Myrs) Columbia River Basalts (17-6 Myrs, Most Myrs) Yellowstone Hot Spot (14-0 Myrs)

West & High Cascades G-1 West Cascade Arc (37-15 Myrs) High Cascade Arc (5-0 Myrs)

Cascade Volcanoes G-1

Why Do Cascade Volcanoes Exist at All? Subduction

Cascade Eruptions 4000yrs

Historic Cascade Eruptions G-4

Cascade Volcanoes G-1

Mt Baker

Glacier Peak

Glacier Peak Ash Fall 13,100 yr tephra - in inches

Mt. St. Helens April 1980

1980 Eruption - Ash Cloud

1980 Eruption

Damage

Blast / Pyroclastic Flow

Lahars

Eruption October 1, 2004

2005 Dome 81 Million Cubic Meters as of April, 2006

2005 Dome February 22, 2005

July 27, 2006 Feb, 2005 Current Dome Growth

Thermal Image - July 27, 2006 Time-lapse animation

June 29, 2006