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[report整理] SENEWS-2011-03-21

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a powerful earthquake struk the northeastern coast of japan at 2:46 pm local time on marth 11th. japan's media relargecal agence releast first trsunami waring just 3minutes later. the country has one of the best earthquake early  waring equipments in the world. there are more than 4000 scientists made in ten city maters in place throughout japan to major  earthquake gets activity.  this maters provided information within 2 minutes of the earthquake happening . information about the strengh and the center of the earthquake can be learned within 3 minutes. there were also cancrete sea walls around much of japanese coast lines. but these majors proved no match for the powerful earthquake and trsunami. costs of is the trsunami acsbirds with the part of civil and environmental engineering at the university of sudden california and los engilis "japan is one of the most well-prepared countrys on earthquake and trsunami waring . the heady waring ,i think what was wrong is they had no in the size  of the c " he says there are 2 reasons for this,japan hasnot had any event anywhere near as big as this one in the last one hundred fifty years. And scientists had not  expected such a large earthquake happening off the coast in japan. the nine point zero ma earthquake was the fourth most powerful earthquake ever recorded worldwide. it was also the worst earthquake ever to hit japan. the trsunami waves that followed was reported to reach as high as 13 meters in some aeras. coast  says japan cancrete sea walls were not built to handle such high waves. "the concrete sea walls in many places in japan about 5meters about 33 feets,  in the sand they were about 3meter about 10feets. so that is so stillat least aeros there were not expecting at such a high wave way ."  a trsnani wave can travel as fast as 800 kilometers per hour ,to get to a higher ground people would often have to travel for a many kilometers. this can take  more time than a fast travelling trsunami will permit. this is especially true in cases like japan where the ceter of the earthquake struk so closed to the coast line. the trsunami waves followed almost immidieatly. experts say early waring systems will continue to be limited by this fact until earthquakes and trsunamis can be pridicted.
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