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This is the voa technology report.A powerful earthquake stuck the northeastern coast of Japan at two forty-six pm local time on *.Japan's * released its first tsunami warnings just three minutes later .The country has one of best earthquake early warning systems in the world .There are more than four thousand *intensity meters in place throughout Japan to measure earthquake activity ,these meters provide information within two minutes of an earthquake happening .Information about the strength and the center of the earthquake can be learned within three minutes .There are also **around much of the Japanese coast line ,but these measures prooved no much for the powerful earthquake and tsunami .*is a tsunami expert with a department of civil and environmental engineering at the university of southern california in *.Japan is one of the most well be *countries on earth in the tsunami warnings ,they had warning ,I think what's was wrong *He says there are two reasons for this ,Japan has not had any event anyone  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 of Japan .
The nine point zora magnitude earthquake was the fourth most powerful earthquake even recorded world wide .It was also the worst earthquake even to hit Japan .The tsunami waves that followed were reported to reached as high as thirteen meters in some areas .*says Japan's *civil will not build to handle such high waves .
The *civils in many places in Japan are about seven meters such about thity-three feed ,in the *about three meters such about *feet .so that's so *will not expecting to such a *wave .
As tsunami wave can travel as fast as eight hundred kilometers 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 true in cases like Japan where the center of the earthquake stuck so close to the coast line that tsunami waves followed almost immediately .Experts say early warning systems will continue to be limited by this facts until earthquakes and tsunamis can be *.
And that's the voa special english technology report written by *.You can find more news about the disaster in Japan at our website voaspecialenglish.com .You can also find transcripts ,mp3s and *about our report  ,and you can find us on facebook and youtube at voa learning english .I'm steve Ember .

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