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Tsunami and Typoons


Tsunami and Typhoons


Tsunami
Tsunami is high tidal wave generated by a shift in the ocean floor, which is in most cases caused by the earthquake. Many of Japanese seacoast has experienced tsunami damage. The Sanriku coast in the Tohoku region has particularly suffered huge damage. The reason, scientist assume, is the formation of ria coastline consisting of a multitude of narrow and complicated bays, which may make the tsunami wave even higher. Immediately after the earthquake off the southwestern coast of Hokkaido in 1993, major tsunami with a maximum height of 20m, hit the coast of Okushiri Island. The number of death and missing caused by the tsunami totaled 230.

What is deference between typhoons and hurricanes?
A hurricane is a tropical cyclone that developed in the North Atlantic ocean and the Indian ocean and is defined as a rain storm with maximum wind speed of over 32.7m per second. a typhoon is a tropical cyclone that developed in the western part of North Pacific ocean. and refer to a rain storm with a maximum wind speed of over 17,2m per second. The origin of word of typhoon is said to be Chinese word "taifung" that means big wind. The nature of typhoon and hurricane are basically the same.although they differ in the place they are born,and the way their wind speed is defined.

How often does Japan have Typhoon a year?
Roughly speaking, 4 typhoon hit the nation annually. The average number of typhoons born in the western part of the northern Pacific ocean is 27 per year. Not all of them head for Japan because of the influence of seasonal upper layer winds that move typhoons. Typhoons in spring and winter go west on the trade winds and never land in Japan. but those in summer and autumn go around the west end of the high pressure system in the Pacific ocean, and in many cases end up going in the direction of Japan.

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