Tsunami

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  • Tsunami waves can propagate in all directions. In the deep ocean, tsunami waves can propagate with the speed of 500-1000 km per hour. Wave height in the deep ocean is only about 1 meter. When approaching the coast, the tsunami wave speed decreases to about 30 miles per hour, but its height was increased to tens of meters. Tsunami waves hit can go up to tens of kilometers from the shoreline
  • Tsunami

    1. 1. Tsunami
    2. 2. Topics: • Definition of tsunami • The causes of Tsunami • Characteristic of tsunami • The effect • Countermeasures of Tsunami
    3. 3. Definition of Tsunami Tsunami(harbor wave): The displacement of water caused by changes in sea surface vertically with a sudden. Back
    4. 4. The causes of Tsunami 4 causes of sea level changes:  an earthquake centered under the sea  underwater volcanic eruptions  underwater landslides  meteor or lacing at sea Back
    5. 5. Characteristic of Tsunami Tsunami cause damage by two mechanisms: the smashing force of a wall of water travelling at high speed, and the destructive power because of large volume of water. While everyday wind waves have a wavelength of about 100 meters and a height of roughly 2 meters, a tsunami in the deep ocean has a wavelength of about 200 kilometers. Such a wave travels at well over 800 kilometers per hour, but owing to the enormous wavelength the wave oscillation at any given point takes 20 or 30 minutes to complete a cycle. This makes tsunamis difficult to detect over deep water. This is the reason for the name "harbor wave". About 80% of tsunamis occur in the Pacific Ocean, but they are possible wherever there are large bodies of water, including lakes. They are caused by earthquakes, landslides, volcanic explosions. Back
    6. 6. The Effect to Enviroment• To People: -Loss of lives & family. -Loss of jobs & living. -Loss of livestock. -Negative impact on the affected region's economy. -Negative impact of the affected region's tourism. • To the Environment: -Alteration of seaside terrain. -Wildlife casualties. -The sea will be temporarily littered with debris after the tsunami. -Coral or Marine Reef damage (In tropical regions). Back
    7. 7. Countermeasures of Tsunami Effect • The detector equipment should be well maintained. • Train the people how to overcome the tsunami. • Make seawall around the shoreline. • Preparation of evacuation • More alert when there is an eartquake above 6sr.
    8. 8. Thank For Your Attention Presented by:

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