Question

What is Tsunami ? Explain .

Answer 1

A tsunami is a series of fast moving waves in the ocean caused by powerful earthquakes orvolcanic eruptions. A tsunami has a very longwavelength. It can be hundreds of kilometerslong. Usually, a tsunami starts suddenly. The waves travel at a great speed across an ocean with little energy loss. They can removesand from beaches, destroy trees, toss and drag vehicles, houses and even destroy wholetowns. Tsunamis can even be caused when a meteorite strikes the earths surface, though it is very rare.

The water often draws back from the seacoast half of the wave period prior to the wave getting to the coast. If the slope of the coast is not deep, the water may pull back for hundreds of meters. People who do not know of the danger often remain at the shore.

Tsunamis cannot be prevented. However, there are ways to help stop people dying from a tsunami. International and regional warning systems, especially for the Pacific Ocean, issue alerts before the big waves reach theshore. 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 26 December 2004. It was caused by anearthquake. The earthquake was said to have a magnitude of 9.3 on the Moment magnitude scale. It was centered in the ocean near the coast of Sumatra, Indonesia. Over 215,000 people, mainly on the shores of the Indian Ocean, died from this disaster. The giant wave moved very quickly. Hundreds of thousands of people in Indonesia, Sri Lanka, Thailand,India, Somalia, and other nations, were killed or injured by it.

Tsunamis are often called tidal wavesbecause they usually rise and fall more slowly than ordinary ocean surface waves. This name is misleading, because tsunamis are not related to tides; they merely rise slowly like tides do, though less slowly.

Tsunami is a Japanese word for Harbor Wave'. (Tsu = Harbor' + Nami = Wave).

Answer 2

A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.