tsunami

1. Tsunami

2. Topics:
• Definition of tsunami
• The causes of Tsunami
• Characteristic of tsunami
• The effect
• Countermeasures of Tsunami

3. Definition of Tsunami
Tsunami(harbor wave):
The displacement of water caused by
changes in sea surface vertically with
a sudden.
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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
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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.
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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).
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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. Thank For Your Attention
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