Tsunami

“tsu” – meaning harbour

“nami”– meaning wave

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.

It causes seismic activities like earthquake ,landslides,volconic eruptions,explosions can create Tsunami.

Deformation of sea floor due to the movement of plates.

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

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.

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.

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.

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.

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.

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.

Death number inIndia

Tamilnadu: 7950 Pondicherry: 580 Kerala: 170 Andhra Pradesh: 105 Nagapatnam

alone(Tamilnadu):6050

Courtesy of DigitalGlobe Jan 1, 2004

Courtesy of DigitalGlobe Dec 26, 2004

Courtesy of DigitalGlobe Dec 26, 2004

Courtesy of DigitalGlobe Dec 26, 2004