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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21
A powerful earthquake struck the north eastern coast of japan at two 2:46 pm local time on march17, janpan's media relogical agence released its first trunami warnings just 3' later, the country has one of the best earthquake early warnings in the world, there are morn than 4000 science make intensity meters in please through out japan to measure earthquake active, these meters provide information within 2's of an earthquake hapening, information about the stength and the center of the earthquake can be learned within 3minutes, there were also concrete sea walls around much of the japanese coate line,but this measures proved no match for the powerful earthquake and tsunami, costal seno likas is a tsunami expert with the depart of the civil and enviromental engineering at the univerity of southern california in los, japan is one of the most well prepared countries on earth ensential even trunami warnings, they had a warning, i think what was wrong is they had not ...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 scientist had not expect such large earthquake happenning off the coast of japan,the 9.0 zero magnitude earthquake was the fourth most powerful earthquake ever recored worldwide,it was also the worst earthquake ever to hit japan, the tsunami waves that followed were reported to have reached as high as 30 in some areas, costal sino says japan's concrete sea walls were not built to handle such high waves,the concrete sea wall in many places in japan about 30 meters, such about 33 feet,in the center that is about 3 meters, that is about 10 feets,so that's also used it at least in dark area, they are not expecting a such sizealbe wave a trunami can travel as fast as 800 km per hour, to get the higher ground, people would often have to travel for many kms, this can take more time, than a tsunami will permit,this is especially ture in cases like japan, where the center of the earthquake stuck so close to the coast line,the tsunami waves followed almost immediately, experts say early warning system wil continue to be limited by these facts until earthquake and tsunmis can be predicted. and thisis the voa special english technology report

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