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How is a Tsunami?

Earthquake

How is a Tsunami?

Tsunamis, giant waves that arise are when it comes to an earthquake in the deep sea, or a huge mountain slip into the sea. The word “Tsunami” comes from Japanese and means big wave in the harbour.

The giant waves can be caused when earthquakes, landslides, volcanic eruptions, nuclear explosions or meteorite shake no blows to the sea floor. In contrast to normal waves, where the water surges at the ocean surface – in the case of a Tsunami even in the deep layers of water in motion.

Almost unnoticed, to the coast

Tsunamis may travel up to 900 kilometers per hour, and so within a short time whole oceans to cross. On the high seas, this wave is usually, but not higher than two or three meters, and is not noticed because of their large wave length of ships. As long as a Tsunami crosses the deep ocean, is the distance from wave crest to wave crest is 150 kilometres or more. In shallow coastal waters and narrow inlets, the speed of the wave decreases, but goes up to enormous heights of up to 40 meters and can whole tracts of land lay waste.

The coastal form is more influenced by the shape of the Tsunamis. Either there are multiple, rapidly rising and falling floods, a series of waves or, in rare cases, a single powerful flood wave with a steep breaking Front break. Wave with a height of up to 30 meters, an unimaginable destructive force to develop mountains, often far into the Hinterland.

Tsunamis are not uncommon

A serious Tsunami hit Indonesia and Thailand in 2004 and killed about 230,000 people.

The highest Tsunami-risk is because of the great activity of the earth’s crust around the Pacific ocean. Early warning services try with Sensorbojen, computers and satellites to warn the affected areas in good time before the possible giant waves. One of the highest waves was on the 27. August 1883 the eruption of the volcano Krakatau triggered: about 30 meters high, the Tsunami broke at the time, to the coasts of Java and Sumatra, over 36,000 people were killed.

In 1946 an earthquake in the Aleutian Islands triggered a Tsunami In Alaska, five people were killed, hours later, in Hawaii, more 159. In 1992, more than 2000 people died in the Eastern Indonesia, as an island, in the short term in the water mass sank. In July 1998 a tidal wave crack after a quake off Papua new Guinea, more than 1200 people to death.

A satellite image of a village on Banda Aceh in Indonesia illustrates the power of destruction.

In the case of a serious Tsunami disaster on the 26. December 2004 in Southeast Asia, more than 230,000 people were killed. The huge tidal wave that was triggered by a quake of magnitude 9.1 in, swept over large sections of the coast of Indonesia, Thailand, and Malaysia, as well as sections of coast in Sri Lanka and South India.

In March 2011 off the Japanese coast to a severe earthquake that triggered a Tsunami in which over 18,000 people were killed and almost half a Million people to their homes, and homes lost. The Tsunami was the trigger for the nuclear disaster of Fukushima.

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