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How is a tsunami formed

Tsunamis form from underwater earthquakes yes but how does that make the waves get so gigantic

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It doesn't. In deep water a tsunami isn't even a big wave. A boat can go right over one without even noticing it. The problem is when the tsunami hits shallow water.

Unlike normal waves which are only on the surface, a tsunami goes all the way to the bottom. So what happens when a miles (or kilometers) high wall of water hits the shallower seabed near a shore? It piles up. Not miles high, of course, since the water crumbles, but still rather high. And with the forward momentum it just keeps piling up and driving forward.

Posted on Oct 22, 2013

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SOURCE: causes of Tsunami

Tsunami is a Japanese word meaning ''huge wave'' that refers to a series of large ocean waves. It is caused basically due to underwater earthquake, Richter magnitude exceeding 7.5 to produce a destructive tsunami.


Concept can be summarized as follow:


The earth is constantly moving on large tectonic plates. When these tectonic plates moves past each other, collide and/or slide under one another an earthquake results. This is what happened with the recent tsunami that devastated Southern Asia. A massive earthquake in the Indian Ocean measuring 10.0 on the Richter scale jolted the seabed causing the sudden displacement of a very large volume of water. The earthquake temporarily produces a fluctuation in the mean sea level of a specified area. Waves quickly form as the displaced water tries to recapture equilibrium by filling the vacuum that was created. Tsunamis are a series of extremely long waves that are created after a large volume of water is displaced. The amount displaced must be significant enough to create waves underwater in the vast ocean. Waves are formed as the displaced water mass moves under the influence of gravity to regain its equilibrium. The larger the displacement, the larger the wave generated.

Posted on Jun 18, 2010

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The latest figures on Tsunami about when and where and the ***** toll


Tsunamis generally aren't the enormous towering unbroken waves seen in the movies, rather, a wide mass of water and foam resembling a huge broken surge wave with great power behind it.

Historical very destructive tsunamis
  • Sumatra, Indonesia - 26 December 2004. ...
  • North Pacific Coast, Japan - 11 March 2011. ...
  • Lisbon, Portugal - 1 November 1755. ...
  • Krakatau, Indonesia - 27 August 1883. ...
  • Enshunada Sea, Japan - 20 September 1498. ...
  • Nankaido, Japan - 28 October 1707. ...
  • Sanriku, Japan - 15 June 1896. ...
  • Northern Chile - 13 August 1868.

Aug 18, 2017 | Miscellaneous

2 Answers

How many tsunamis are there in a year in japan


Hi Emma:
Not really a car/truck question however, there are no specific number of tsunamis as they are caused by earthquakes that are located so that they create a massive displacement of water.

Mar 29, 2015 | Cars & Trucks

1 Answer

What is a tsunami and how it forms.


Hello Anonymous,
What a question! I hope you're in no danger from a tsunami because that's definitely something you don't want to tangle with. Tsunamis are caused (usually) by an underwater earthquake, eruption or some other anomaly. They in turn create waves that are truly killers. Remember the tsunami of several years ago? Scores of people vanished and were never heard from again. A word of caution, however. If you do find yourself in a tsunami, go inland immediately, and please bear this in mind; if you think the first wave is bad, subsequent waves are even worse. You're better off on land than on the ocean during a tsunami. Tsunami waves can travel very fast, upwards of 300-400 miles per hour so you can't outrun them. Hope this answered your question.

Sep 17, 2014 | Google Chrome

1 Answer

How is a tsunamis formed


tsunamis are formed due to the shift of tectonic plates usually due to earth quake. due to this a large volume of water is shifted creating a wave. once this wave approach the shored they speed up and create collosal damage.

May 28, 2014 | Computers & Internet

1 Answer

When do tsunamis happen


Tsunamis happen when there is an underwater earthquake, causing the ocean floor to move violently up or down. When the ocean floor moves like that, the water above it has to go somewhere so it spreads out in a very fast wave. The wave is a tsunamis.

May 27, 2014 | Computers & Internet

1 Answer

What are the causes of tsunami


Usually caused by an under sea earthquake.
Check out this WEB site for details.
http://wiki.answers.com/Q/What_causes_a_tsunami

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1 Answer

What causes tsunami


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.

Feb 14, 2013 | Computers & Internet

1 Answer

Can tsunamis be predicted?if so how?


tsunamis are triggered from earthquakes the earths plates move in such a way that forces the water movement at incredible mass waves are produced

Oct 04, 2011 | Measuring Tools & Sensors

1 Answer

I want to know if the tsunami is kind of ecological backlash. and what is the cause of tsunami


It is caused from an earthquake in the ocean. The ground shifts and causes the water motion.

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1 Answer

Causes of Tsunami


Tsunami is a Japanese word meaning ''huge wave'' that refers to a series of large ocean waves. It is caused basically due to underwater earthquake, Richter magnitude exceeding 7.5 to produce a destructive tsunami.


Concept can be summarized as follow:


The earth is constantly moving on large tectonic plates. When these tectonic plates moves past each other, collide and/or slide under one another an earthquake results. This is what happened with the recent tsunami that devastated Southern Asia. A massive earthquake in the Indian Ocean measuring 10.0 on the Richter scale jolted the seabed causing the sudden displacement of a very large volume of water. The earthquake temporarily produces a fluctuation in the mean sea level of a specified area. Waves quickly form as the displaced water tries to recapture equilibrium by filling the vacuum that was created. Tsunamis are a series of extremely long waves that are created after a large volume of water is displaced. The amount displaced must be significant enough to create waves underwater in the vast ocean. Waves are formed as the displaced water mass moves under the influence of gravity to regain its equilibrium. The larger the displacement, the larger the wave generated.

May 03, 2010 | Yosemite Technologies TapeWare 7.0...

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