A tsunami is a large sea wave generated by earthquakes, landslides, or volcanic eruptions that displace large volumes of water. When this activity displaces the sea floor, it generates waves that can travel across oceans at high speeds. Though imperceptible in deep waters, tsunamis grow in height and power as they reach shallower coastal waters, posing a threat to coastal regions. Monitoring systems use sensors and satellites to detect tsunamis and issue warnings to protect coastal communities.

1. Tsunami

2. “tsu” – meaning harbour
“nami”– meaning wave

3.  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.

4. It causes seismic
activities like
earthquake ,
landslides,volconic
eruptions,explosions
can create Tsunami.
Deformation of sea
floor due to the
movement of plates.

5. 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/ wavelength
ie., greater the wavelength lesser is the
energy

7. 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.

8. 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.

9. 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.

12. 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.

13. 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.

15. 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.

16.  Death number in
India
 Tamilnadu: 7950
 Pondicherry: 580
 Kerala: 170
 Andhra Pradesh: 105
 Nagapatnam
alone(Tamilnadu):6050

17. Courtesy of DigitalGlobe Jan 1, 2004

18. Courtesy of DigitalGlobe Dec 26, 2004

19. Courtesy of DigitalGlobe Dec 26, 2004

20. Courtesy of DigitalGlobe Dec 26, 2004