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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 northeast coast of Japan at 2:46 locatal time on March 11.Japan's media relogical agency release its first tsunami warning just 3 minutes later.the country has one of the best earthquake early warning system in the world.There are more than 4,000 seismic intensity meters in place throughout Japan to measure earthquake activity.these meters provide imformation within 2 minutes as the earthquake happening.Imformation about the strength and center of the earthquake can be learned in 3 minutes.There are also concrete sea walls around the much of Japanese coast line but these measures prove no match for  the powerful earthquake and tsunami.Carnol Seana is an tsunami expert with the department of civil and environmental enginering at the university of southern Canifornia in LA.Japan is one of  the most well prepared countries on earth in terms of  tsunami warnings.they had a warning I think what was 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 had not expected such a large earthquake happening off the coast of Japan.the 9.0 magnitude earthquake was the first most powerful earthquake ever recorded worldwide and it was also the worst earthquake ever to hit Japan.The tsunami waves followed were reported to reach as high as 13 meters in some areas.Carnol Seana lucky says Japan concrete sea walls were not bulit to handle such high waves.concrete sea walls in many places in Japan about 10 meters,that's about 33 feet.in XX,they were about 3 meters,that's about 10feet.that's also use at least of that area they were not expecting such a sizeable wave.tsunami waves can travel as fast as 800 kilometers per hour.To get the higher ground people were often have to travel for many kilometers.this can take more time than fast traveling tsunami will permit.this is especially true in cases like Japan where the center of the earthquake struck so close to the coast line. the tsunami waves followed almost immediately.experts say early warning systems will continue to be limited by these facts until earthquake and  tsunami can be perdicted.and that is the VOA special english tecnology report.
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