may 18, 1980 eruption. before may 18, 1980 spirit lake

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May 18, 1980 Eruption

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Page 1: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980 Eruption

Page 2: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Before May 18, 1980

Spirit Lake

Page 3: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Before May 18, 1980

Spirit Lake

Page 4: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Summit - 1965

Mt. St. Helens

Page 5: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Pre- 1980

Mt. St. Helens

Page 6: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

March 20, 1980

Mt. St. Helens

Page 7: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

March 27, 1980

First Crater

Page 8: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

March 30, 1980ash on summit

Mt. St. Helens

Page 9: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

April 6 Steam blast

Mt. St. Helens

Page 10: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

April 10

Mt. St. Helens

Page 11: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

April 12, 1980Chehelis, I-5

Mt. St. Helens

Page 12: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

April 27, 1980Bulge on north side grows (5 ft. per day)

Mt. St. Helens

Page 13: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 3, 1980Bulge on north side grows to 400 ft.

Mt. St. Helens

Page 14: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 17, 1980Bulge on north side grows to 450 ft.View from Johnston’s Ridge 6 miles NW

Mt. St. Helens

Page 15: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 17, 1980David Johnston’s campView from Johnston’s Ridge 6 miles NW

Mt. St. Helens

Page 16: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980Eruption after largest knownrock slide, avalanche releasedpressure and triggered a 9 hour ash and pumice eruption. Plumemoved east at 60 miles per hr.

1300 ft. (400 meters) of thepeak collapsed.

200 million cubic yards (150 million cubic meters) of material deposited directly by lahars , volcanic mudflows,into river channels.

57 people killed or missing.

Mt. St. Helens

Page 17: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Mt. Adams in background

Mt. St. Helens

Page 18: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Mt. St. Helens

Page 19: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Mt. Adams in background

Mt. St. Helens

Page 20: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Blowdown in the North Fork Toutle drainage, with singed area on left.

Mt. St. Helens

Page 21: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Blowdown in the South Fork Toutle drainage, with singed area in middle.

Mt. St. Helens

Page 22: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

The slopes of Smith Creek valley, east of Mount St. Helens, show trees blown down by the May 18, 1980 lateral blast.

Over four billion board feet of usable timber, enough to build 150,000 homes, was damaged or destroyed.

Mt. St. Helens

Page 23: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

May 18, 1980 lahar covering highway at the Toutle River. The bridge was wiped out

Mt. St. Helens

Page 24: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

More than 200 homes and over 185 miles (300 kilometers) of roads were destroyed by the 1980 lahars. Pictured here is a damaged home along the South Fork Toutle River.

Mt. St. Helens

Page 25: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Debris avalanche, with the beginnings of the mudflow heading down the North Fork Toutle River Valley.

Mt. St. Helens

Page 26: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 31, 1980

Reid Blackburn's car, located approximately 10 miles from Mount St. Helens. Reid was a photographer for National Geographic as well as the Vancouver's Columbian newspaper

Mt. St. Helens

Page 27: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Spirit Lake, Pumice Plain, and phreatic explosions, soon after the May 18, 1980 eruption of Mount St. Helens

Mt. St. Helens

Page 28: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 29: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 30: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 31: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 32: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 33: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

Ash along the roadside, Connell, Washington.

Mt. St. Helens

Page 34: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

May 18, 1980

,Connell, Washington.

Mt. St. Helens

Page 35: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After - Sept. 16, 1980

Volcanic ash collected in Randle, Washington, located about 40 km NNE of Mount St. Helens.

Mt. St. Helens

Page 36: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After - Oct. 4, 1980

Spirit Lake, once surrounded by lush forest, is within the area devastated by blast. Remnants of the forest float on the surface of the lake

Mt. St. Helens

Page 37: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After – August 22, 1980

For weeks volcanic ash covered the landscape around the volcano and for several hundred miles downwind to the east. Ash fell in eleven states. The total volume of ash (before compacted by rainfall) was enough ash to cover a football field to a depth of 150 miles (240 kilometers).

Mt. St. Helens

Page 38: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After- Sept 30 , 1980

Harrys Ridge, five miles north of Mount St. Helens' crater was within the blast zone. The view is from the southeast.

Mt. St. Helens

Page 39: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After - Sept. 30, 1980

Aerial view of Mount St. Helens volcano, with Harrys Ridge in the foreground.

Mt. St. Helens

Page 40: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After – May 19View of denuded slope and blowdown timber

Mt. St. Helens

Page 41: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

After – May 19View of denuded slope and blowdown timber

Mt. St. Helens

Page 42: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Mt. St. Helens

Page 43: May 18, 1980 Eruption. Before May 18, 1980 Spirit Lake

Photos and information:

USCS As an unbiased, multi-disciplinary science

organization that focuses on biology, geography, geology, geospatial information, and water, we are dedicated to the timely, relevant, and impartial study of the landscape, our natural resources, and the natural hazards that threaten us. Learn more about our goals and priorities for the coming decade in our Science Strategy.

“Mount St. Helens, Washington Before, During, and After May 18, 1980 1980 – 2004”http://vulcan.wr.usgs.gov/Volcanoes/MSH/Images/MSH80/framework.html

“Mount St. Helens, Washington May 18, 1980 Eruption Images”http://vulcan.wr.usgs.gov/Volcanoes/MSH/Images/may18_images.html