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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21

A powerful earthquake strikes the northeast coast of Japan at 2:46 pm, local time, on March 11. Japan meterological agency released first tsunami warning just three miniutes later. The country has the one of the best earthquake early warning systems in the world. There are more than 4000 seismic intensity meters in place throught Japan to measure earthquake activity. These meters provide information within two minutes with the earthquake happening. Information about strength and center can be learned within three minutes. There are also concrete seawalls around much of Japanese coastline. But these measures proved no match for the powerful earthquake and tsunami.
K is a tsunami expert within the department of civil and environmental engineering at the university of southern carlifornia in Los Angeles. Japan is one of most well-prepared continent earth owner in tunami warning. They have the warning, I think   He said 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 of Japan.
The 9.0 Magnitude earthquake was the fourth most powerful earthquake ever recorded worldwide. It was also the worst earthquake ever to hit Japan. The tunami waves that followed were reported to reach as high as 13 meters in some areas.
K says Japan concrete seawalls were not built to handle such high waves. The concrete seawalls in many places in Japan are about 7 meters 33 thick. In ** they were about 3 meters A tsunami wave can travel as fast as 800 kilometers per hour. To get a higher ground people would have to travel for many kilometers. This can take more time than the fast travelling tsunami will permit. This is especially true in Japan the center of earthquake is so close to coastline. The tunami then followed immediately. Experts say early warning system continues to be limited by this fact until earthquake and tsunami can be predicted.

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