সুনামির কারণে সমুদ্রের পানি ফুলে উঁচু হয়ে উপকূলে আঘাত হানে। প্রতীকী ছবি- সংগৃহীত
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Tsunami
Tsunami is a Japanese word, meaning ‘harbor wave’ and used as the scientific term for seismic sea wave generated by an undersea earthquake or possibly an undersea landslide or volcanic eruption. When the ocean floor is tilted or offset during an earthquake, a set of waves is created similar to the concentric waves generated by an object dropped into the water. Since 1819, about 40 tsunamis have struck the Hawaiian Islands. A tsunami can have wavelengths or widths, of 100 to 200 km and may travel hundreds of kilometers across the deep ocean, reaching speeds of about 725 to 800 km/h. Upon entering shallow coastal waters, the wave, which may have been only
about half a meter (a foot or two) high out at sea, suddenly grows rapidly. When the wave reaches the shore, it may be 15 m (50 ft) high or more. Tsunamis have tremendous energy because of the great volume of water affected. They are capable of obliterating coastal settlements. The world’s most powerful Tsunami occurred on 26 December, 2004. It hit the coastal areas of India, Srilanka, Maldives and Indonesia which are situated on the shore of the Pacific Ocean. Thousands of human lives and animals have been killed and property of million dollars worth have been damaged. It has come as a natural disaster that has changed the total biological structure of the region. Actually, we have nothing to do in the face of Tsunami. But adequate and timely forecast can save many people. There should be Tsunami Monitoring Centre in the Bay of Bengal to warn people.
লেখক : সহযোগী অধ্যাপক, ইংরেজি বিভাগ
আদমজী ক্যান্টনমেন্ট কলেজ, ঢাকা
কবীর
