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[report整理] SENEWS-2011-03-21

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This is the VOA Spedial English Technology Report.
A powerful earthquake ? the northeast coast of Japan at 2:46 pm local time on March 11th.Japan's media ? Agency released first tsunami warning just three minutes later.The country has one of the best earthquake early warning systems in the world.There are more than 4,000 ? intansity meters in place throughout Japan to measure earthquake activity. These meters provide information within two ninutes earthquake happening. Information about the strengthen and the center of the earthquake can be learned within three minutes. There are also concrete seawalls around much of the Japanese coastline. But these measures proved no match for the powerful earthquake and tsunami.
? ? is a tsunami expert with the department of civil and enviromental engineering at the University of the Southern California in Los Angeles."Japan is one of the most well-prepareed countries on earth ? tsunami warning. The hard warning, I think what was wrong is they hadn't despite even the ? of survive"
He says there are two reasons for this. Japan has not had any event anywhere near as big as this one in the last 150 years. And scientists had not expertsd such a large earthquake happening of the coast of Japan. The 9.0 magnitude earthquake was the forth most powerful earthquake ever recorded worldwide.It was also the worst earthquake ever to hit Japan.
The tsunami waves that followed were reported to averaged as high as 13 meters in some areas.
C S says Japan's concrete seawalls were not built to handle such high waves. "The concrete saewalls in many places in Japan are about ten meters that's about 33 feet. In the ? ,they were about three meters that's about 10 feet. So that shows you that at least in that area they were not expecting such size of wave."
A tsunami wave can travel as fast as 800 kilometers per hour. To get higher grand, people will often have to travel for many kilometers. This can take more time than a fast travelling tsunami will permit. This is especially true in cases like Japan where the center of the earhquake struggle so close to the coastline. The tsunami waves followed almost immediately. Experts say early warning systems will continue to be limited by these facts until earthquakes and tsunamis can be predicted.
And that's the VOA Special English Technology Report, written by June Simms.
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