tsunami formation

the formation of a tsunami

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Bethany Rossiter 05/11/10
Tsunami formation
1. Tsunamis are caused by earthquakes underneath the sea. Earthquakes occur
when two plates suddenly move against each other.
2. A tsunami forms when the energy from the earthquake forces up the seabed
by several metres. This displaces hundreds of cubic kilometres of water.
3. This creates large waves. These waves begin to move away from the
epicentre of the earthquake.
4. In deep water the tsunami travels fast but with a shallow wave height. But
when it reaches shallower water it slows causing the wave to rise up
increasing in size.
5. Tsunamis give no natural warnings except from when the wave is
approaching the sea retreats exposing hundreds of metres of seabed and
6. The waves then hit the land at intervals of between 5 and 40 minutes. The
tsunami doesn't break like normal waves it keeps travelling on over the land
for as far as it can, this can be as much as 1km inland.
Why are tsunamis often more devastating than the primary hazard that caused
The primary hazard that caused the tsunami is the earthquake. The earthquake
that causes a tsunami often happens miles out to sea in deep water. This therefore
has no direct effect on people because the sea is deep here the earthquake doesn't

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Bethany Rossiter 05/11/10
create huge devastating waves here. The earthquake just creates the tsunami it
doesn't cause all the devastation to the people on the land. The tsunami however
surges in and destroys everything in its path. Few are killed by the actual wave
but they are killed by being trapped under trees, washed away or by being hit by
fallen debris. In the long term people are killed by not having shelter or enough
food or the right medical care.…read more


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