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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 northeast coast of Japan at 2:46 PM local time on march 11 the geological agency released its first tsunami warnings just 3 minutes later. The country has one of the best earthquake early-warning systems in the world . the are more than 4000 sense make intensity meters make in place throughout japan to measure earthquake activity.these meters provide  information within 2 minutes as the earthquake happening .
Imformation  about the strength and the center of the earthquake can be learned within 3 minutes. There are also concrete sea walls around much of japanese coastline. but these measures provide no match for the powerful earthquake and tsunami....is a tsunami expert with the department of sea and environmental engineering at the university of sudden,California, in los anglos.
Japan is one of the well prepared country on earth in tensure even tsunami warnings. they had a warning i think what is drawn, anticipated as the big as the size of this one.
He says there are 2reason for this .Japan has not had any event anywhere near as big as this one in the last 150 years. And scientist has not expected such a large earthquake happening of the coast of japan. The 9.0 magnitude earthquake was the 4th most powerful earthquake ever recorded worldwide, it was also the worst earthquake ever to hit japan. The tsunami waves that followed were reported to reached as high as 13 meters in some areas. Japan's concrete sea walls were not built to handle such high waves 'the concrete sea walls in many places in japan are about 3 meters 33 feet. in 仙台, it was about 3 meter. at least in that area they are not expecting such size of a wave.
a tsunami wave can travel at as fast as 800 km/h. to get to higher ground, people would often have to travel for many kilomisler . 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 earthquake struck so close to the coastline.
The tsunami waves followed almost immediately. Experts say early warning systems will continue to be limited by these facts until earthquake and tsunamis can be predicted





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