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[report整理] SENEWS-2011-03-21

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This is the VOA special English technology report
A powerful earthquake struck the northeastern coast of Japan at 2:46 P.M local time on M. Japan’s media geological agency released the first tsunami warning just three minute later. The country has one of the best earthquake early warning systems in the world. There are more than four thousand seismic 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 center of the earthquake can be learned within three minutes. There were also concrete sea walls around much of the Japanese coastline. But these measures proved no match for the powerful earthquake and tsunami. K. is a tsunami expert with the . he says there are two reasons for this: Japan has not had any event anywhere near as big as this one in the last one hundred years, and scientists had not expected such a large earthquake happening off the coast of Japan. The nine point zero magnitude earthquake was the fourth most powerful earthquake every record worldwide.
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