This makes tsunamis difficult to detect over deep water. Since the wave still has such a long wavelength, the tsunami may take minutes to reach full height. Some regions with a high risk of tsunamis may use warning systems to warn the general population before the big waves reach the land. Pictures show people walking on the normally submerged areas with the advancing wave in the background. Of these, many were recorded in the AsiaâPacific regionâparticularly Japan.The 2004 Indian Ocean tsunami killed over 200,000 people with many bodies either being lost to the sea or unidentified.According to an article in Geographical magazine (April 2008), the Indian Ocean tsunami of December 26, 2004 was not the worst that the region could expect. The giant wave moved very quickly.
Such a wave travels at well over 800 kilometres per hour (500 mph), but due to the enormous wavelength the wave oscillation at any given point takes 20 or 30 minutes to complete a cycle and has an amplitude of only about 1 metre (3.3 ft).
This is misleading, because tsunamis are not related to tides.Some tsunamis can be caused by the overlapping of tectonic plates.There are only a few other languages that have a native word for this disastrous wave. Because an earthquake that caused the tsunami can be felt before the wave gets to the shore, people can be warned to go somewhere safe.The deadliest tsunami recorded was on December 26, 2004.
People who do not know of the danger will often remain at the shore. The water will draw back from the coast half of the period of the wave before it gets to the coast. Few survived.The first scale that genuinely calculated a magnitude for a tsunami, rather than an intensity at a particular location was the ML scale proposed by Murty & Loomis based on the potential energy. (For the plural, one can either follow ordinary English practice and add an s, or use an invariable plural as in the Japanese. A large tsunami may feature multiple waves arriving over a period of hours, with significant time between the wave crests. Professor Costas Synolakis of the Tsunami Research Center at the University of Southern California co-authored a paper in Geophysical Journal International which suggests that a future tsunami in the Indian Ocean basin could affect locations such as Madagascar, Singapore, Somalia, Western Australia, and many others. Its wavelength diminishes to less than 20 kilometres (12 mi) and its amplitude grows enormously, producing a distinctly visible wave. In recent years, this term has fallen out of favor, especially in the scientific community, because tsunami actually have nothing to do with tides.
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