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Mount St.Helens
MOUNT ST.HELENS
TABLE OF CONTENTS
1. Location
2. History
3. Eruptions
4. Damages
5. Video
1. LOCATION
1. LOCATION
1. LOCATION
- Gifford Pinchot National Forest
- Cascade Range
- 55 km from Mount Adams
- 80 km from the Mount Rainier
2. HISTORY
2. HISTORY
2.1. HISTORY OF ERUPTIONS
2.1.
- most frequent
- "Ape Canyon Stage":
40,000–35,000 years ago
- "Cougar Stage":
20,000–18,000 years ago
- "Swift Creek Stage":
13,000–8,000 years ago.
- “Spirit Lake Stage":
since 2500 BCE
3. ERUPTIONS
3.1. TYPE OF ERUPTION
3.1.
1) andesite and dacite
2) olivine and andesite
3) ash and viscous lava
ANDESITE
DACITE
2.2.
2.2. 1980 ERUPTION
3.2.
- most important eruption of the U. S.
- plinian eruption
- March 20, 1980:
- magnitude 4.2 earthquake.
- March 27, 1980:
- steam venting
- end of April:
- the north side of the mountain started to bulge.
- On May 18, 1980:
- magnitude 5.1 earthquake triggered a massive collapse of the north face
- pyroclastic flow
- destroyed vegetation and buildings over 600 km2
- ash cloud that spewed hundreds of kilometers
- 1.5 million metric tons of sulfur dioxide
- 5 on the Volcanic Explosivity Index Scale.
4. DAMAGES
4.1. 1980 damages
4.1.
- most destructive in U.S. history
- 57 people died
- thousands of animals were killed
- 200 homes were destroyed
- 300 km of roads damaged
- 25 km of railways damaged
- 860 million dollars in expenses
5. VIDEO
SUMMARY
6. SUMMARY
THE MAIN POINTS TO REMEMBER ARE:
1) LOCATED IN AMERICA
2) 2,500 M HIGH
3) 40,000 YEARS OLD
4) 1980 ERUPTION:
- MOST DEADLY OF NORTH AMERICA
- SECOND MOST COSTLY OF ALL THE HISTORY
- 600 KM 2 DESTROYED(AND COVERED BY ASH)
SOURCES
- https://www.worldatlas.com/articles/mount-st-helens-unique-places-in-north-america.html
- https://fr.wikipedia.org/wiki/Mont_Saint_Helensf
- https://businessofstory.com/my-improbable-story-of-survival-during-the-1980-eruption-of-mt-st-helens/
- https://inhabitat.com/40-earthquakes-hit-mount-st-helens-in-4-days/
- https://milesandlove.com/photos/etats-unis/mont-saint-helens/mont-saint-helens-avant-avant-eruption
- https://twitter.com/mtsthelenswa
THE END
THANKS FOR YOUR ATTENTION!