What is a tsunami? What gives rise to a tsunami?

1.	What is a tsunami? What gives rise to a tsunami?
Answer» 1. Waves generated by an earthquake or volcano occurring on the ocean floor is called ‘tsunami’. ‘Tsunami’ is a Japanese word which means ‘harbour wave’. 2. As on land, earthquakes and volcanic eruptions occur, at the bottom of the sea, too. 3. If an earthquake occurs at the bottom of ocean, the energy released pushes the water upwards. As a result of this particular type of waves are formed. 4. These waves are not very high near the source, but they start spreading very fast to long distances. 5. The velocity of these waves is 800 to 900 km/hr. When they reach a coastal area, their velocity is reduced, but their height is found to have increased tremendously even to about 30 m. These are tsunami waves.

Answer»

1. Waves generated by an earthquake or volcano occurring on the ocean floor is called ‘tsunami’. ‘Tsunami’ is a Japanese word which means ‘harbour wave’.

2. As on land, earthquakes and volcanic eruptions occur, at the bottom of the sea, too.

3. If an earthquake occurs at the bottom of ocean, the energy released pushes the water upwards. As a result of this particular type of waves are formed.

4. These waves are not very high near the source, but they start spreading very fast to long distances.

5. The velocity of these waves is 800 to 900 km/hr. When they reach a coastal area, their velocity is reduced, but their height is found to have increased tremendously even to about 30 m. These are tsunami waves.

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