Mount St. Helens - case study
Causes, Effects, Immediate responses and Long Term responses
- Created by: Jenny Jones
- Created on: 19-10-13 12:09
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- Mount St. Helens - case study
- Causes
- DESTRUCTIVE plate boundary
- The Juan de Fuca plate subducted under the North America plate
- Bulge in side of mountain lava build up
- Blew its top causing a LATERAL blast
- 5.1 on RICHTER SCALE causes BIGGEST LANDSLIDE EVER
- Earthquakes and steam filled with ash- signs of an eruption
- DESTRUCTIVE plate boundary
- Effects
- EVERYTHING 27km NORTH OF THE CRATER WIPED OUT
- 8km exclusion zone
- 57 people died
- 250 homes, 47 bridges, 15 miles of railway and 185 miles of road destroyed
- Biggest Landslide ever recorded
- Nearby cities become dark because of ash cloud
- Roads and Air con clogged by ash
- 15cm of ash fell
- Water produced from melting snow and ice created mud flows
- This choked the river and killed all fish and water life
- Every tree within 30 km of the volcano was uprooted and flattened
- The Spirit Lake was filled with mud killing over 12 million Salmon
- The ash that had eventually fallen made the soil more fertile (positive impact)
- EVERYTHING 27km NORTH OF THE CRATER WIPED OUT
- Immediate Responses
- Helicopters search and rescue
- 200 people rescued
- Shelter provided for those who had lost homes and stranded tourists
- Ash cleared from roads
- Medical supplies given to injured
- Helicopters search and rescue
- Long Term Responses
- Building and bridges need rebuilding
- Drainage checked so that it wasn't blocked by debris and cause floods
- Forest replanted
- Roads rebuilt
- Tourist industry rebuilt
- Millions of trees replanted and fallen tree removed
- Causes
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