2009年11月26日木曜日

Mechanism of Tsunami












We talk about Tsunami and Earthquake. I am going to talk about Mechanism of Tsunami. Do you know Tsunami means? There is it in America, isn't it ? Tsunami is very big wave. It is the tidal wave that is caused by earthquake. By the way, Tsunami is a Japanese word. Then, how does earthquake causes Tsunami? First, the time when an earthquake caused in the ocean, Water sinks quickly. Second, Water comes back at a dash. Finally, Water becomes very big tidal wave. It is Tsunami!! Tsunami is not normal wave. Please look at this picture. It shows difference between normal wave and Tsunami. Tsunami is not taller than normal wave, but it is the Wall of Water!! It makes people drown!! How dangerous it is!! I explained Mechanism of Tsunami.