Volcan Chaiten May 2008 Volcanic eruption

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  • Volcan Chaiten May 2008
    • Responses
      • Immediate
        • 3,900 evacuated 2 days after
        • 50 km exclusion zone around town
        • Chilean officials distributed fresh water and protective masks
      • Long term
        • 2009 Feb 25 plans to rebuild Chaiten 10 km above Santa Barbara
        • abandon town
          • relocate and compensate residents
        • April 20th president announced plans to rebuild Chaiten in existing area
      • Mid Term
        • government monthly stipend equivalent to $1,200 and $2,200 per family
          • $300 above average incomes
          • until relocated and back to work
        • financial aid to small businesses
          • 90 day freeze on payment of existing loans
    • Causes
      • Between PACIFIC and S. AMERICAN PLATES
        • above SUBDUCTION ZONE
    • SOUTH CHILE
      • one of most economically advanced countries in S Amercia, but still in LEDW
      • Stable, democratic government
    • Effects
      • Social
        • 1 death
        • Lahars + ash
          • Communities cut off
            • limited access
        • Local hospitals treated for breathing difficulties
        • 90% town = damaged
          • 30% town = destroyed
        • Damaged to aircraft and marine facilities hampered rescues
      • Environmental
        • May 14th, announced 90% flooded due to increased flows of Rio Chaiten
          • eruption triggered polar storm
            • heavy rain and ash blocked rivers = FLOODS
        • Small no of asphyxiated cattle by ash
          • agriculture is large part of economy
        • 15cm ashfalls blocked rivers
          • contaminated groundwater supplies
      • Economic
        • Several hundred domestic flights in Chile and Argentina cancelled
          • dozens of international flights cancelled
    • Nature
      • Rhyolotic Lava
      • Lots of pyroclastics
      • ash column = 30km high
    • what
      • 1st earthquake = late 30th April 2008
        • eruption = May 1
          • Ash and explosions = 2-8th May
            • New dome generated 540,000m^2 area and contained 52millionm^3 of new material
              • Column collapsed= vast amount of ash to the ground
    • Management
      • Volcano = 'Low threat'
        • last eruption = 9,400 years ago
          • dormant when 10,000 years ago
      • Not actively monitored
        • not many resources
      • Not high priority
        • only 4,000 residents

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