Tsunami

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

Definition of Tsunami

Tsunami(harbor wave): The displacement of water caused by

changes in sea surface vertically with a sudden.

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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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Characteristic of TsunamiTsunami 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

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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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.

Thank For Your Attention

Presented by: Ajie

Nursetya P.