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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 struck the northeastern coast of Japan at 2:46 p.m local time on March 11th. Japan's medial logical agency released its first tsunami warnings just three minutes later. The country has one of the best earthquake early warning systems in the world. There are more than four thousand science make intensity metres in place throughout Japan to measure earthquake activity. These metres 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 concrete seawalls around much of the Japanese coastline. But these measures proved  no match for the powerful earthquake and tsunami. kusta sinalikes is a tsunami expert who is in the department of severe and environmental engineering at the University of Suburn California in Los Angels.
Japan is one of the most well-prepared country on earth * * tsunami warnings. They had warning. I think what was wrong is that they had not * the size of the tsunami.
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 in Japan. The 9.0 magnitude earthquake was the forth most powerful earthquake 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 13 metres in some areas. kusta sinalikes says Japan's concrete seawalls were not built to handle such high waves.
The concrete seawalls in many places in the Japan are about 7 metres or about 33 feet. In the SanDai they are about 3 metres or about 7 feet, so that's always used at least in that area they were not expecting such a size of wave.
A tsunami wave can travel as fast as 800 kilometres per hour. To get the higher ground , people would often have to travel for many kilometres. This can take more time than a fast travelling tsunami will permit. This is especially true in cases like Japan where the center of the tsunami struck so colse to the coastline. The tsunami waves followed almost immediately. Experts say early warning systems will continue to be limited by this facts until earthquakes and tsunamis can be predicted.
And that's the VOA Special English Technology Report written by June Sins. You can find more things about the disarster in Japan at our website:VOASpecialEnglish.com. You can also find transcripts,MP3s and broadcasts of our reports. And you can find us on facebook and YouToo at VOA Learning English. I'm Steve Ember.

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