Tsunami
From Simple English Wikipedia, the free encyclopedia
A tsunami is a type of wave in the ocean caused by earthquakes, volcanic eruptions, or even meteors. It is measured on the Richter Scale by an instrument called a seismograph.
A tsunami is a very long wave. It can be hundreds of kilometres long. It is a chain of fast moving waves caused by fast changes in the ocean. A tsunami can begin when the rocks weighing as much as 20 tonne fall into the ocean. Usually, tsunami starts suddenly. It will begin as normal waves and change to a very big wave very quickly. The waves travel at a great speed across an ocean with hardly any energy losses. They can remove sand from beaches, tear up trees, damage houses and even destroy whole towns.
The water will draw back from the coast half of the period of the wave before it gets to the coast. If the slope of the coast is shallow, the water may pull back for many hundreds of metres. People who do not know of the danger will often remain at the shore. Tsunamis can not be prevented, but there are ways to help stop people from dying from a tsunami. Some regions with a high risk of tsunami may use warning systems to warn the general population before the big waves reach the land. 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.
[edit] Deadliest Tsunami
The deadliest tsunami in recorded history was on December 26, 2004. A 9.3 earthquake was centered in the ocean near the coast of Sumatra, Indonesia. Over 225,000 people died from this disaster. Moving very quickly, hundreds of thousands of people in Indonesia, Sri Lanka, Thailand, India, Somalia, and other nations, were killed or injured by the giant wave.
