Tsunami is a scary natural phenomenon. You could see how powerful its strength was when the tsunami hit Japan on March 11, 2011 after the 8.9 scale earthquake hit Fukushima prefecture.
A word of ‘tsunami’ (つなみ) originates from the Japanese word which means ‘harbor wave’ or in Japanese written word ‘津波’. Very often, tsunamis are incorrectly thought to be caused by tidal waves. In fact, they are not caused by tides.
You all know that the gravitational pull or force of the moon on the sea can cause tides. Thus, the normal waves of the sea are caused by the wind.
Do you know that tsunamis can travel in a tremendous speed? Yes, tsunamis can travel at a speed of more than nine hundred and seventy kilometers per hour in the open ocean. This is almost as fast as a speed of an airplane! And it takes just a few hours for tsunamis to move across an entire ocean which is a scary scene to witness with your naked eyes, isn’t it? A normal wave caused by wind, can usually travel at a speed of about ninety kilometers per hour.
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