it is very amazing ppt

1. Tsunamis
PRESENTED BY
DEVNARAYAN
V!!!_C
ENGLISH
HOLIDAY
HOMEWORK

3. Overview
• Tsunami - what is it?
• Tsunami Formation
• What is the Physics behind them?
• Warning systems?
• Examples of Tsunamis
• Animations/Simulations
• Conclusion
• References
• Questions

4. Tsunami- what is it?
Definition:
 Unusually large wave in a harbour (Japanese)
 Series of water waves generated by huge and
sudden perturbation
(e.g. earthquakes, slides, volcanoes,
asteroids)
Characteristics:
 Wave period: 2-200 minutes
 Run-up heights: O(10-100 m)
(Flooding of shoreline)
 Speed

5. Tsunami Formation

6. Tsunami Formation
• Tsunamis can be generated when the sea floor suddenly displaces the overlying water
vertically.
• Tectonic earthquakes are a kind of earthquake that can cause that.
• When they occur beneath the sea, the water above the deformed area is displaced
from its equilibrium position.
• Waves are formed as the displaced water mass, acting under the force of gravity, tries
to regain equilibrium.
• When large areas of the sea floor elevate or subside, a tsunami can be created.
• Large vertical movements of the earth's crust can occur at plate boundaries, at the
faults.

7. Tsunami Formation
• As a tsunami leaves the deep ocean and travels toward the shallow
coast, it transforms.
• A tsunami moves at a speed related to the water depth, therefore
the tsunami slows as the water depth decreases.
• The tsunami's energy flux, being dependent on both its wave speed
and wave height, remains nearly constant.
• As a result, the tsunami's speed decreases as it travels into shallower
water, and its height increases.
• When it reaches the coast, it may appear as a rapidly rising or a
series of breaking waves.

8. Tsunami Formation
• As a tsunami reaches the shore, it begins to lose energy .
• It Slows down and height increases when approaching shallow coast
• Tsunamis reach the coast with tremendous amounts of energy.
• Destructive power is due to speed and force with which they strike the
coastal area.
• Tsunamis are stronger and retain height longer than waves generated by
wind.

9. What’s the Physics behind the Waves………

10. WAVES WITH VIDEO

11. PUBLIC WARNING SYSTEM
can you tell if a tsunami is coming?
• The U. S. ESSA operates warning systems.
• Its PTWC in Hawaii is the regional operational center for tsunami
information in the Pacific
• A Tsunami Watch Bulletin is released when an earthquake occurs
with a magnitude of 6.75 or greater on the Richter scale.
• A Tsunami Warning Bulletin is released when information from tidal
stations indicates that a potentially destructive tsunami exists.
• This system is not very reliable. For example, Honolulu was
evacuated in 1948 on a false alarm at a cost of more than $30
million dollars.

12. TSUNAMI WAVES VIDEO

13. Examples of Tsunamis
26thDec2004
-The fifth-largest earthquake in a century with magnitude of
8.9 Richter scale
-struck the coast of the northern Indonesia Island of Sumatra
-triggered tsunamis in Srilanka, India,tourist islands in
Thailand , Maldives, some part of East Africa
1992
The Cape Mendocino quake produced a tsunami that hit
Humboldt Bay within 20 minutes
1964
an earthquake in Alaska produced a destructive tsunami that
inundated Crescent City

14. Simulations/ Animations

15. Wave Propagation simulation

16. SUNAMI VIDEO

17. TSUNAMI CAUSES

18. WAIT AND SEE

19. LET SEE THE WAVES

20. AFTER TSUNAMI VIDEO

21. SIMULATION OF TSUNAMI VIDEO
WAIT 5 SEC AND SEE

22. TSUNAMI IN CITY VIDEO

23. 3D CITY TSUNAMI VIDEO

24. BLENDER CITY SUNAMI VIDEO

25. LET SEE TSUNAMI

26. The end