tsunami
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Tsunami
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“tsu” – meaning harbour
“nami”– meaning wave
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A Tsunami is a large wave that are generated in a water body when the sea floor is deformed by seismic activity. This activity displaces the overlying water in the ocean.
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It causes seismic activities like earthquake ,landslides,volconic eruptions,explosions can create Tsunami.
Deformation of sea floor due to the movement of plates.
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EARTHQUAKE
Tsunami have large wavelength of about 500 km .
It travels across the deep sea at very high velocity of at around 800-900 km/hr
Rate of loss of it’s energy α 1/ wavelengthie., greater the wavelength lesser is the loss of energy
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When tsunami approaches the sea ,
it’s velocity decreases,the height and energy of the wave increases.
It’s height near the sea shore ranges from 15m to 65m.
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i. Tsunami is generated when the sea floor abruptly deforms and vertically displaces the overlying water.
ii.Earthquake are associated with the earth’s crystal deformation.
iii.When the earthquake occurs beneath the sea , the water above the deformed area is displaced from it’s equilibrium position.
iv.Waves are generated , when the displaced water mass regains it’s equilibrium.
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Tsunami attacks mostly the coastlines ,causing devastating property ,damage and loss of life.
Tsunami affected the wealth of the country.It may also spread lot of water borne diseases.
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Step 1: Earthquakes, under the water , are monitored by sensors on the floor on the sea.Step 2: The sensors send the information of floating buoys on the surface, whenever they detect any changes in pressure of the sea. Step 3: The information is then relayed to satellites, which passes it on to the earth stations.
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Step 4: All member nations of the warning system are then warned of the danger approaching.
Step 5: Finally country make the people alert through the media to take all necessary precautions.
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The tsunami would have travelled at the speed of jet engine of 700-800 km/hr and hit Tamilnadu and Srilanka coast about 2-3 hours after the Earthquake.
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Death number inIndia
Tamilnadu: 7950 Pondicherry: 580 Kerala: 170 Andhra Pradesh: 105 Nagapatnam
alone(Tamilnadu):6050
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Courtesy of DigitalGlobe Jan 1, 2004
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Courtesy of DigitalGlobe Dec 26, 2004
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Courtesy of DigitalGlobe Dec 26, 2004
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Courtesy of DigitalGlobe Dec 26, 2004
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