Tsunamis by ramee teklemichael
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Tsunamis by ramee teklemichael

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Tsunamis by ramee teklemichael Tsunamis by ramee teklemichael Presentation Transcript

  • Tsunamis
    By Ramee Teklemichael
  • A tsunami is a series of water waves caused by the displacement of a large volume of a body of water, usually an ocean.
  • Earthquake, volcanic interruption, and other underwater explosions cause tsunamis.
  • The term of tsunami comes from two Japanese words tsu meaning harbor and nami meaning wave.
  • Tsunamis are referred as tidal waves but in the recent years the term as fallen out of favor because tsunamis have nothing to do with tides.
  • Tsunamis have a small wave height offshore, and a very long wavelength often hundreds of kilometers long, which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimeters above the normal sea surface.
  • When the wave enters shallow water, it slows down and its height increases.
  • Regions with a high tsunami risk use tsunami warning systems to warn the population before the wave reaches land.
  • Computer models can predict tsunami arrival, usually within minutes of the arrival time.
  • A 2004 earthquake in the Indian Ocean measuring 9.0 on the scale set off a tsunami that struck at 10 Asian and three African countries, leaving at least 130,000 people dead.
  • The 2011 earthquake in japan caused a 9.0 tsunami, 9,523 deaths, 2,775 injured, 16,094 people missing, and 125,000 buildings damaged.
  • Not counting the 2011 tsunami in Japan, there were 26 tsunamis that killed at least 200 people or more in the last century.
  • Most tsunami occur in the Pacific and Indian Oceans. The boundary of the Pacific Ocean experiences frequent earthquakes.
  • In the open ocean, a tsunami can travel as fast as 950 kilometers per hour, which can be represented by the speed of a passenger jet.
  • It loses speed as it approaches land, but it does not lose much of its energy. As it slows down, the height of the waves build.
  • Tsunami warning sign
  • THE END