boxing day tsunami

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  • Boxing Day Tsunami 2004
    • Where?
      • 150 miles from sumatra
      • 30 kilometer focus - shallow
      • eurasian and australian plate
      • enery disapates are waves through the water
      • little public education about tsunamis
    • impacts
      • 3/4 of its victims died in sumatra
        • no tsunami warning system in the indian ocean
          • pacific tsunami warning centre
      • 1 meter squared of water weighs 1 tonne - force
      • 20% of coral reefs destroyed
      • 30000 hectares of land has long term soil damage
      • fisheries buildings and bridges destroyed
      • 1,000,000+ killed
    • out at sea versus in land
      • out at sea
        • low amplitude
          • 200m wave length
            • 500-900km/h
      • inland
    • formation: earthquake triggers tsunami - quake causes sea bed to move - movement displaces water above - waves radiate out from epicentre - waves travel at high speeds- as water gets shallower the waves compress concentrating their energy, waves slow and draw back. wave hits but only travels a short distance inland
  • high amplitude up to 30m
    • 20 meter wave length
      • 80km/h
        • wave train

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