The Tsunami waves…

Posted by Freddy on Oct-31-2010

As a mariner my life is always tied with the ocean which makes my life incredible. The deepest oceans have many untold mysteries, legends and stories. The beauty of the ocean has been well described by many great poets and writers. The water in these oceans has made our life on earth possible. Water gives life but the same water leads to destruction. It can show its most terrorizing face with violent ‘Tsunami’ waves.
Tsunami… The word itself fills us with terror. It reminds us of the black day, when the killer waves wiped the lives of over millions of people. Tsunami is a Japanese word which means ‘harbor wave’. Tsunami is a series of water waves caused by the displacement of a large volume of water. Due to the immense volumes of water and energy involved, tsunamis can ruin coastal regions. Earthquakes, volcanic eruptions and other underwater explosions, landslides and other mass movements, meteorite ocean impacts or similar impact events, and other disturbances above or below water all have the potential to generate a tsunami.
Tsunami is generated when the sea floor suddenly deforms and vertically displaces the overlying water. Tectonic earthquakes are earthquakes that are associated with the earth’s crustal deformation and when these earthquakes occur underneath the sea, the water above the distorted area is displaced from its equilibrium position. Tsunamis have small amplitude offshore, and a very long wavelength. That is the main reason why the waves usually pass unnoticed at sea, forming only a slight swell usually about 12 inch above the normal sea surface. They grow in height when they reach shallow region.
A tsunami can occur in any tidal state and even at low tide. Scientists discovered that extremely large landslides from volcanic island collapses can generate mega tsunami, which can travel trans-oceanic distances.

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