` 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.

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Presentation transcript:

` 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? 1805

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

Oregon cinder cone: Pilot Butte (N of Bend)

Oregon Cinder Cone: Tabor

Mount Tabor

Krakatau

Krakatau 1883

Cascade Volcanoes (Mount Jefferson)

Need to know: Sulfur pic

Are we in danger?

Portland is 50 miles SE of Mount Hood

How far will the lava flow?

Review: Are we in danger?

Is Mount Hood active?

Fumerole at Hogsback on Mt. Hood

Fumeroles near Crater Rock

Devil’s Kitchen hot ash and sulfur.

Most recent eruption – 200 years ago, created the lava dome Crater Rock

Review: How Active Is Mount Hood?

What gave the north face is features?

South Face avalanche – where did the lahar go?

Hood River Delta

North Face debris avalanche changed the Columbia River’s path.

l Lahar Deposits – White River Drainage 2006

Highway 35

Hood River from creek to full river during 2006 flood.

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

Rt 35 heading towards Mount Hood Meadows and Timberline.

White River Bridge (Normally has a 20’ clearance beneath it.)

Ranier is predicted to have devastating lahars.

1805

Why is the south face relatively flat and smooth?

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.