Mount St. Helens is a stratovolcano located in Washington state along the Cascadia Subduction Zone. It has experienced several major eruptions throughout history, most notably in 1980 which lasted several hours and rated a 5.1 on the Volcanic Explosivity Index. These eruptions have caused widespread environmental destruction through ashfall, landslides, and lahars, in addition to social impacts like evacuations and economic costs including infrastructure damage and losses to the timber industry. Long-term effects include changes to the local landscape and ecosystem.

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Mount st.
Mount st.
helens
helens

2. Location
Location
Location: United States, North America
Name of the Volcano: Mount St. Helens

3. tectonics
tectonics
Mount St. Helens is located in
the Cascadia Subduction Zone.
It is situated on the boundary
between the Juan de Fuca Plate
and the North American Plate.

4. Type of volcano
Type of volcano
Mount St. Helens is a
stratovolcano.
Characteristics include steep
slopes, periodic explosive
eruptions, and the presence of
a central vent.

5. frequency of
frequency of
eruption
eruption
Mount St. Helens has experienced major
eruptions in 1980, 2004, and other smaller
eruptions.
Historical records indicate a history of both
explosive and effusive eruptions.

6. Volcanic
Volcanic
eruptions
eruptions
Key Eruption: May 18, 1980
Duration: Several hours
Magnitude: 5.1 on the Volcanic Explosivity
Index

7. enviromental impact
enviromental impact
Destruction of surrounding forests and ecosystems, ashfall affecting air and water quality
and landslides and lahars leading to changes in topography.
social impact
social impact
Evacuation of nearby communities, loss of lives and injuries and displacement of
residents and long-term effects on mental health.
Economic impact
Economic impact
Infrastructure damage, including roads and bridges, losses in the timber industry
and cost of recovery and rebuilding.

8. Short-term consequences
Short-term consequences
Immediate closure of airspace due to ash clouds.
Emergency response and search-and-rescue operations.
long-term consequences
long-term consequences
Changes in the landscape, with the formation of a new crater.
Slow recovery of ecosystems.
Continued monitoring for potential eruptions.

10. Thank
Thank
You!
You!