Tsunamis are series of waves generated by rapid displacement of water, often caused by earthquakes, landslides or volcanic eruptions. They are different from tidal waves in that they are not caused by gravitational effects of celestial bodies. Tsunamis have extremely long wavelengths and periods. Signs of an approaching tsunami include a sudden receeding of water exposing areas usually submerged, as the trough of the wave approaches land. The devastating 2004 Indian Ocean tsunami was caused by a 9.3 magnitude earthquake off the coast of Sumatra, Indonesia, displacing massive volumes of water and causing over 230,000 deaths across several countries.

1. TSUNAMI

2. # “TSU” MEANS HARBOUR AND “NAMI” MEANS WAVE.TSUNAMI = HARBOUR + WAVE.# Tsunami is a series of waves with extremely long wave length and long period generated when a body of water rapidly displace. # Tsunami is not a tidal wave because the tides are the result of gravitational influences of the moon, sun and planets.DEFINITION

3. # Earthquake# mass movements above or below water# some volcanic eruptions# Underwater explosions# Landslides# Large asteroid impact.CAUSES OF TSUNAMI

4. CHARACTERISTICS# Tsunamis are shallow-water waves, which means the ratio between the water depth and water length is very small.

5. # “NO WARNING!!”, “NO PREDICTIONS”# Earthquakes are often a cause of tsunami.# IF the part of tsunami to reach land is trough (draw back) rather than a crest of the wave, the water along the shoreline may recede dramatically, exposing areas that are normally always submerged.SIGNS OF AN APPROACHING TSUNAMIS.

6. WARNING AND PREVENTION# BOTTOM PRESSURE SENSORS. These are anchored and attached to buoys. Sensors on the equipment constantly monitor the pressure of the overlying water column.

7. GENERATION OF TSUNAMI Earthquake Water column up and down Potential energy Kinetic energy Tsunami

8. Initial tsunamiDistance LocalHeight above mean sea level is the half of the original tsunami.

9. # Increases and wave length decreases.This result in steepening of the leading wave.# Deep ocean tsunami has traveled much faster than the local tsunami because of the propagation speed.

10. # Run up is a measurement of the height of the water onshore observed above a reference sea level. # The first run up of a tsunami is often not a largest.

11. # Tsunamis are not rare, with at least 25 tsunami occurring in the last century. # Many tsunamis were recorded in the Asia-Pacific region-particularly Japan. # The boxing day tsunami (Indian ocean tsunami) in 2004 caused approximately 350,000 deaths and many more injuries.TSUNAMI IN HISTORY

12. # It was an undersea earthquake.# Occurred on December 26, 2004 of magnitude 9.3 with an epicentre off the west cost of Sumatra, Indonesia.#Second deadliest earthquake of all time observed up to 10 minutes #US Geological Survey recorded the toll as 283,100 killed ,14100 missing, and 1,126,900 people displaced Countries affected:-Indonesia,Srilanka,Bangladesh,India,Malaysia,Myanmar,Singapore,Maldives2004 INDIAN OCEAN TSUNAMI

13. MALDIVESTHAILANDSRI LANKAINDONESIA

14. EPICENTRE AT SUMATRA,INDONESIA

15. CHARECTERISTICS#The sudden vertical rise of the seabed during earthquake displaced massive volumes of water #Tsunami wave height in shallow water near coastline:-24 to 30 meter and in deep water the maximum height was 2 foot

16. Tectonic Plate#994 miles of fault line slipped about 50 foot along the subduction zone #Indian Plate slides under the Berma Plate#Energy released on the earth surface was 1.1*10^17 joules or 26.3 megatons(equivalent to 1502 times of the Hiroshima atomic bomb)

17. IMPACTS OF 2004 TSUNAMI-Loss of human life-shortage of food and drinking water -damage of the infrastructure-spreading of diseases-economic damage such as fishing business, tourism, shipping-environmental impact for many years on ground water , soil and ecosystem

18. HELPLESS AGAINST TSUNAMI!!!