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homework
this is the voa special english technology report.
a powerful earthquake strike the northeastern coast of japan at 2:46 pm local time on *.japan's media relargical agency released its first tsunami warnings just three minutes later.the country has one of the best earthquake earlt warning systems in the world.there are more than 4000 science make intercity meters in places throughout japan,to maesure earthquake activity.these meters provide information within 2 minutes seven earthquake happening.information about the strength and the center of the earthquake can be learned within 3minutes.there are also concrete cilvors around much of the japan coast line.but these measures proved no match for the powerful earthquake and tsunami.* is a tsunami expert with the department of civil and environmental engineering at the university of southern california in los angeles.

japan is one of the most well prepared countries on earth * in * warnings, because the warning,what i think what was wrong is they have morden *  expected the science * .

he says there are two reasons for this,japan has not had any event anywhere near biggest this one in the last 150 years.and scientists had not expected such a large earthquake happening of the coast of the japan.the 9.0 magnitude was the 4th most powerful earthquake ever recorded worldwide.it was also the worst earthquake ever to hit japan.the tsunami wave that followed were reported to average as high as 13meters in some areas,*says japan's concretes walls were not build to handle such high waves.

the * in many places in the japan are about 7meters or about 33 feet in the *,so that use of it at least not the area they would not expected to stop such * wave.

a tsunami wave can travel as fast as 800kilometers per hour,to get to higher ground,people would often have to travel for many kilometers,.this can take more time than a fast traveling tsunami will permit.this is especially to in cases like japan where the center of the earthquake strength so close to the coast line,the tsunami waves followed almost immediately,experts say early warning system will continues to be limited until earthquakes and tsunamis could be predicted.