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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21

This is a VOA special english tecnology report.
A powerful earthquake struck the northeasten costa Japan at 2:46 pm local time on Marth 11th.Japan'media relogically engency released first tsunami warnings just three minute later.The country has one of the best earthquake early warning systems in the world.   There are more than four thousand Seismic Intensity Meters in place thoughout Japan to measure earthquake activity.This meters provided information with in two minutes spended earthquake happening. Information about the struke and the center of the earthquake can be learnt with in three minutes .There are also concrete sea walls around much of the Japanese costal line.But these measures proved no match for the powerful earthquake and tsunami. Costas Synolakis is a tsuami expert with the Department of Civil and Enviamental Engineering at the university of southern california in los Angeles.Japan is one of the most well-prepared countris on earth in terms of truami warning.They had a warning.I think what went wrong is that they had not antipipated the size ofthe events .
He says there are two reasons for this.Japan has not had any event anywhere near as biggest as this one in the last 115 years.And scientists had not expected such a large earthquake happening of the coast of Japan. The 9.0 magnitude earthquake was the fourth most powerful earthquake ever recorded worldwide.It was also the worst earthquake ever to hit Japan.The tsunami waves the followed were reported to average as high as 13 meters in some areas.COSTAS SYNOLAKIS says Japan' concrete sea walls were not built to handle such hige waves.The concrete sea walls in many places in Japan about 10 meters.That's about 33 feet. In sendai,they were about 3 meters,that's about 10 feet.So that shows you that at least in that areas they were not expecting such a sizeble wave.A tsunami wave can travel as fast as eghit hundrad kilometers per hour.To get the higer ground ,people woule often have to travel for many kilometers.This can take more time than a fast travelling tsunami will permit.This is a specially true in case like Japan where the certer of the earthquake struck so close to coastline. The tsunami waved followed almost immediatly.Experts say earthquake warning systerms will continue to be limited by this facts until the earthquake and tsunami can be predicted.
And that's the VoA special english teconology report ,written by JUne simmits.You can find more news about the dizaster in Japan at our wibesite Voa special english .com  You can also find transcripts ,mp3s and  postcasts of our reports.and you can us on facebook and yoto at VOA learning english.I am steve ember.





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