Tsunami is a series of water waves called tsunami wave train that is caused by the dis placement of a large volume of a body of water. The original Japanese term literally translates as "harbour wave".
Tsunamis are frequent occurence in Japan; approximately tsunami has struck Japan in 195 events. Due to the immense volumes of water and energy evolved, tsunamis can destroy coastal regions. Casualties can be high because the waves move faster than humans can run.
Earthquakes, volcanic eruptions, underwater eruptions due to detonations of nuclear devices at seas and oceans, landslides, other mass movements, bolide impacts and other disturbances above or below water have the potential to generate a big tsunami.
The Greek historian Thucydides was the first to relate tsunami to submarine earthquakes, but understanding of tsunami's nature remained calm until the 20th century and is the subject of ongoing research.
The study of how tsunamis work is called tsunamigenesis.
Some metrolofical conditions, such as deep depressions that cause tropical cyclones, can generate a storm surge, called a meteotsumani, which can rise tides several meters above normal levels. The displacement comes from low atmospheric pressure within the centre of the depression. As these strom surges reach shore, they may resemble tsunamis, inundating vast areas of land. Such a storm surge inundated Myanmar in May 2008.
Washington, Sep 26th: a line of massive boulders on the western shore of tonga may be the evidence of the world's largest tsunami debris, which is upto 9 meters [30 feet] high and weighing upto 1.6 million killograms [3.5 million pounds]. The seven house-sized coral boulders were likely flung ashore by a wave revailing in the in the 1883 krakatau tsunami, which is estimated to have towered 35 meters [115 feet] high. Currently they are located 100 to 400 meters [300 to 1,300 feet] from the coast. these could be the largest boulders placed by a tsunami,worldwide, said Matthew Hornbach of the University of Texas Institute of Geophysics. Karakatau tsunami was nat a one-off event, he added.
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N.T.Ganatma
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