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发表于 2011-3-23 13:28
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[Homework]SENEWS-2011-03-21
This is the VOA special English technology report. A powerful earthquake struck the NE coastof Japan at 2:46 pm local time on March 11. Japan's media ? agency realeased it's 1st tsunami warnings just 3 mins later, the country has one ofthe best earthquake early warning systems in the world. There are more than 4000 science ? meters in place throughout Japan to measure earthquake activity, these meters provide imformation within 2 mins of the earthquake happening, imformation about the stress and the center of the earthquake can be learned within 3 mins, there are also ? sea*s around much of the Japanese coast line, but these measures proved no match for the powerful earthquake and tsunami, ?? is the tsunami expert with the department of civil and environmental engineering at the University of Southern California in LA.Japan is one of the most well? countries on earth ? in tsunami warnings, behind the warning, I think what ? He say there are 2 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 4th most powerful ever recorded worldwide, it was also the worst earthquake ever to hit Japan. The tsunami waves that followed were reported to have reached as high as 30m in some area. ?? says Japan's ?? were not built to handle such high waves, ?? in many places in the Japan about 5 meters,that about 33 feet, in the Sendai that were 3 meters that about 30 feet, so that ? not expected to ?such a high wave. A tsunami wave can travel as fast as 800 km per hour, ? higher ground people would often have to travel for many kilometres, 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 struck so close to the coast line. The tsunamo waves followed almost immediately, experts say early system will continue to be limited by these facts until the earthquakes and tsunamis can be predicted. And that the VOA SE technology report, written ??, you can find more about the disaster in Janpan at our website voaspecialenglish.com, you can also find transcripts、 mp3s and ? of our repots, and you can find us on Facebook and Youtube at voaspecialenglish. I'm Steve Ember.
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