Describe the 3 types of cones and how they form..

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Presentation transcript:

Describe the 3 types of cones and how they form.

Bbelknap Shield Volcano Belknap Shield Volcano

Thick (Mt. St. Helens Lava Dome) vs Thin Lava Flow

Paricutin Surtsey Iceland This is a shield cone eruption, NOT a cinder cone eruption. How is this eruption different? Cinder Cone

Krakatau 1883

Cinder Cone - Krakatoa Not a Cinder Cone – How can you tell?

Oregon Cinder Cone: Tabor

Mount Tabor

Oregon cinder cone: Pilot Butte (N of Bend)

Composite or Stratocones Mount Jefferson in the Cascade Range

` How violent will it be when it erupts? Is Portland safe? What happened that the north and south faces of Hood look so different? What is its eruption history? (How many, how bad and how recent?) When was the most recent lahar? Mount Hood

Why is the south face so smooth and worn compared to the north face?

Near Hood River Ash deposit 40’ deep.

How violent will it be when it erupts? Is Portland safe? What happened that the north and south faces of Hood look so different? What is its eruption history? (How many, how bad and how recent?) When was the most recent lahar? 1806

Need to know: Sulfur pic

l Lahar Deposits – White River Drainage

Highway 35

Post Volcanic Lahar – Mount Hood, 2006 Newton Creek Rt 35

http:// 710 hood river flood Ash deposit with man standing near: 40 ft deep and 300 ft above the river. 400 feet deep at the time of the lahar.