Tsunamis

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  • Tsunamis
    • causes of tsunamis
      • submarine earthquakes at subduction zones - seabed is displaced vertically which displaces a large volume of water
    • examples
      • 2004 - Boxing Day in Indonesia
      • 2011 - Tohoku, Japan 9 magnitude earthquake caused a tsunami
    • characteristics of a tsunami
      • long wavelength at sea - over 100km (the distance between two peaks of a wave
      • short amplitude at sea - about 1m and barely noticeable - can increase to 25m when reach land
      • velocity - can reach up to 700 kph in deep water, slow down in shallower water
      • drawback - drop in sea level as water is drawn back to use in the tsunami
      • wave train - hit the coastline in a series of waves

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