TSUNAMI%20DESCRIPTION

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TSUNAMI DESCRIPTION
Sponsoring Teacher Ismi Kamarul Sham b.
Ismail Sponsor School Batu 4 Secondary
School City Gerik, Perak Country Malaysia
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Objective Introduction Conclusion
Web References Projects Member
Tsunami Description can give a right definition
of tsunami, to know the cause of tsunami and
where do tsunami occur on our planet.
Objective
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Tsunami Description

1. Definition of Tsunami
2. What causes of Tsunami?
3. Where do tsunamis occurs in the world

Introduction
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Tsunami is a Japanese word meaning harbor wave.
It is constituted with two syllables, Japanese
language meaning harbour ("tsu", ?) and wave
("nami", ?). Tsunami is a wave train or series
of waves generated, by impulsive disturbance that
vertically displaces the water column, in water
body. Earthquake, landslides, volcanic eruption,
explosion and even the impact of cosmic bodies
like meteorites commonly generate tsunami.
Tsunami savagely attacks coastlines causing
devastating property damage and loss of lives.
WHAT?
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Tsunami "Wave Train" Many people have the
mistaken belief that tsunamis are single waves.
They are not. Instead tsunamis are "wave trains"
consisting of multiple waves. The chart below is
a tidal gauge record from Onagawa, Japan
beginning at the time of the 1960 Chile
earthquake. Time is plotted along the horizontal
axis and water level is plotted on the vertical
axis. Note the normal rise and fall of the ocean
surface, caused by tides, during the early part
of this record. Then recorded are a few waves a
little larger than normal followed by several
much larger waves. In many tsunami events the
shoreline is pounded by repeated large waves.
WHAT?
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?

1. Tsunami can be generated when the see floor
   abruptly deforms and vertically displaces the
   overlying water.
2. Tectonic earthquakes are a particular kind of
   earthquake that are associated with the earths
   crustal deformation, when these earthquakes occur
   beneath the see, the water above the deformed
   area is displayed from its equilibrium position.
3. Waves are formed as the displaced water mass,
   which acts under the influence of gravity,
   attempts to regain its equilibrium

WHAT CAUSE?
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?

• Ocean waves are normally divided into 3 groups,
  characterized by depth
• Deep water
• Intermediate water
• Shallow water
• Even though a tsunami is generated in deep water
  (around 4000 m below mean sea level), tsunami
  waves are considered shallow-water waves. As the
  tsunami wave approaches the shallow waters of
  shore, its time period remains the same, but its
  wavelength decreases rapidly, thus causing the
  water to pile up to form tremendous crests, in an
  effect known as "shoaling".

WHAT CAUSE?
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Subduction Zones are Potential Tsunami Locations
WHAT CAUSE?
Most tsunamis are caused by earthquakes generated
in a subduction zone, an area where an oceanic
plate is being forced down into the mantle by
plate tectonic forces. The friction between the
subducting plate and the overriding plate is
enormous. This friction prevents a slow and
steady rate of subduction and instead the two
plates become "stuck".
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Accumulated Seismic Energy
WHAT CAUSE?
As the stuck plate continues to descend into the
mantle the motion causes a slow distortion of
the overriding plage. The result is an
accumulation of energy very similar to the
energy stored in a compressed spring. Energy can
accumulate in the overriding plate over a long
period of time - decades or even centuries.
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Earthquake Causes Tsunami
WHAT CAUSE?
Energy accumulates in the overriding plate until
it exceeds the frictional forces between the two
stuck plates. When this happens, the overriding
plate snaps back into an unrestrained position.
This sudden motion is the cause of the tsunami -
because it gives an enormous shove to the
overlying water. At the same time, inland areas
of the overriding plate are suddenly lowered.
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
Tsunamis occur most frequently in the Pacific
Ocean, but are a global phenomenon they are
possible wherever large bodies of water are
found, including inland lakes, where they can be
caused by landslides. Japan is a nation with
the most recorded tsunamis in the world. The
earliest recorded disaster being that of the 684
A.D. Please refer to the below website of the
List of historic tsunamis by death
toll http//en.wikipedia.org/wiki/List_of_natura
l_disasters_by_death_toll
WHERE?
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What is a tsunami ? What causes a tsunami ?
Where do tsunamis occur ?
WHERE?
Map of tectonic plates where the earthquake
triggered the tsunami
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Tsunami is one of the earths disaster. It was
a Japanese word meaning harbor wave, used as
the scientific term for a class of abnormal sea
wave that can cause catastrophic damage when it
hits a coastline. Tsunamis can be generated
by an undersea earthquake, an undersea
landslide, the eruption of an undersea volcano,
or by the force of an asteroid crashing into the
ocean.
Conclusion
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1. http//www.rumela.com/diary/diary_tsunami.htm
2. http//encarta.msn.com/encyclopedia_761559898/Tsun
   ami.html
3. http//en.wikipedia.org/wiki/Tsunami
4. http//geo-world.org/tsunami/
5. http//geology.com/articles/tsunami-geology.shtml

Website References
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ISMI KAMARUL SHAM B. ISMAIL ismi281173_at_yahoo.com.m
y
Project Members
SITI HAWA BT. MOHD RAZALI sitihawa04_at_yahoo.com.my
NURUL ASHIKIN BT. HAMZAH nurulashikin04_at_yahoo.com.
my
NOR ATIQAH BT. MOHD RAHIMI noratiqah04_at_yahoo.com.
my