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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21

This is the VOA special english technology report.
A powerful earthquake strike the northestern coast of japan, at 2:46 pm local time on  march 11th.Japan's immediate local agency release it's first sunomi warning just three minutes later. The country has one of the best earthquake early warning system in the world. There are more than 40000 sense-make intensity meters in place throughout japan  to measure earthquake acitity , this meters provide imformation within 2 minutes after earthquake happening.Imformation about the strength and center of the earthquake can be learned within 3 minutes. There are also concrete sea walls around much of the japanese coast line,but this measures proved no much for  powerful earthquake and sunomi.c  neklace is a sunomi expert with the department of civil and enviromental engineering at the univeristy of southern california in losangeles. Janpan is one of the most well prepared contry on the earth in the sunomi warnings, they had warning  what is wrong,what is dissipated   . He says there are two reasons for these, japan has not had any event any when near as bigest this one in the last 150 years, and scientist had not expected such a large earthquake happening off the coast of japan. The 9.0 magnitute earthquake was the forth most powerful earthquake ever recored worldwide.It was also the worst earthquake ever to hit Japan. The sunomi wave that followed were reported to reached as high as 19 meters in some area.    said japan's concrete sea walls were not built to handle such high waves. The concret sea walls in many place in the japan were about 10 meters,33 feets, in the sendai there were about 3 meters about 10 feets. so that would be useless at least in that area there were not expenting such a size of wave. A sunomi wave can travel as fast as 800km/h, to get a higher groud, people would often have to travle for many km, this can take more time than the fast traveling sunomi will permit. This is espeiclly true in cases like japan when the center of the earthquke strike so close to the coast line.But sunomi wave followed almost immediately,expert say early waning systems will contiune to be limited by these facts untile earthquake and sunomis can be predicted. And that is the VOA special english technolgy report, writern by june sins.  you can find more news about this disasters in japan and our website VOA special english.com, you can also find transcripts , mp3 and pub of our reports, and you can find this on facebook and youtube at voa learning english. I am sting member.


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