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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21

This is voa Special English Technology Report
A powerful earthquake strucked the northeast of japan at 2:40pm local time on March 18th.Japan's mediarate agency released its first tsunami warning just 3 minutes later.The coutry has one of the best earthquake early warning system in the world.There are more the 4000 Seismic Intensity Meters  in place throughout Japan to measure earthquake activity.These meters provide the information with two minutes of the earthquake happening.

Information about the string and the center of the earthquake can be learned within three minutes.There are also concrete sea walls among the much of the Japanese coastline.But these measures proved no match to the powerful earthquake and sunami.S is the sunami expert with department of civil and environmental engneering at the university southern California in Losangels.Japan is one of those most well-prepared countries on earth in terms of tsunami warning. They had a warning. I think what went wrong is that they had not anticipated the size of this event.”

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 has not the expected such a large earthquake happening at 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 sunami waves are follows were reported to as high as  30 meters in some areas.S says Japan's concrete sea walls were not to build to handle such high waves.The concrete seawalls in many places in Japan are about 10 meters, that's about 33 feet. In Sendai, 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 a sizeable wave because they would have built a higher seawall.”

As sunami waves can travel as fast as 80k/h.To get a higher groud, people were often have to travel for many kilometers.This can take more time than fast travelling sunami will permit.This is a specially truth in case of Japan where the center of the earthquake struck so closed to the coastline.

The sunami waves followed almost immediatelly.Experts say early warning system will continue to be limited by this effect until earthquakes and sunamis can be predicted.

And that's the VOA Special English Technology Report written by June Simmis.You can find more news about the disaster in Japan at our website voaspecialenglish.com.You can also find transcripts mp3s and broadcasts of our reports.And you can find us on Facebook and U tube at voalearning english.I'm Steve Ember.




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