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:
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
May 03, 2010 |
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