A tsunami is a wave in the sea formed by undersea earthquakes. The earthquake shakes the seabed and makes a huge kind of movement in the water. As opposed to a regular wave, which appears in the uppermost layer of the ocean, but the tsunami wave is found throughout the water column, which can be thousand of meters out of to sea. The wave’s length is very long, up to hundreds of meters, and also very fast - like 1000 km /per h, but it slows down to 30-40 km/h when it comes near the coast. In a tsunami there are much larger volumes of water, and massive force that causes the water to penetrate far into the country and bring violent destructions.
The tsunamis occurred when the volcano Krakatoa exploded in Sumatra and Java. 36,000 people were killed by the waves. The highest wave was 40 meters. And the latest tsunami was a powerful earthquake in the Pacific Ocean by Japan's northern coast in March 2011. The tsunami got up to 14 meters over the coast and killed about 15.000 people.
Formed – dannet
Seabed – havbund
As opposed to – I modsætning til
Uppermost – øverste
Throughout – (I hele) overalt
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