2006年VOA标准英语-US Scientists Work on Computer Model to Detect

By Anthony Stokes
Washington, D.C.
14 July 2006
 
watch earthquake report

  
  
U.S. geological experts are working to develop a computer model that can better detect an earthquake and warn people in advance.  VOA's Anthony Stokes looks at how the early warning system in the United States compares to those of other countries. 

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It is a common bond shared by countries around the world - the likelihood that natural disasters, such as earthquakes, can strike at any time.  But what is uncommon¹ is that some countries have installed underground sensors² to detect an earthquake and send out early warnings to prepare people. 

The system works because electronic signals can be sent to a computer much faster than the shock waves that move through the earth. 

Such systems are in place in Japan, Mexico, Taiwan and Turkey.  In the United States, scientists at the California Institute for Technology are also working on ways to warn people just before a quake.  

Tom Heaton  
  
Tom Heaton, an earthquake engineer at Cal Tech, says the system is still years away.  "We have about 150 sensors that are appropriate for this task out in southern California at the moment.  To really run this correctly, my guess is it would take more like 600 sensors."

Work on the early warning software is just beginning, but researchers believe within five to 10 years, warnings could be transmitted to cell phones.  Heaton hopes the new computer system can give residents a warning of at least 30 to 60 seconds.  While that is not a lot of time, Heaton describes a scenario³ in which a short warning could make a big difference.

"I don't know about you," says Heaton, "but I don't want to be stuck in an elevator in an earthquake, so the elevator would go to the closest floor and open the door."

But in southern California, fault lines are everywhere, making it a challenge for the sensors to detect an earthquake. "In many of those instances, you'll be near the epicenter and this system won't help you at all," predicts Heaton.  "You'll just feel the earthquake as severe shaking."

Scientists hope the new model will prepare them in case of another massive earthquake like the one that hit San Francisco in 1906, killing⁴ 3,000 people.  The U.S. Geological Society is also using computer models to recreate the ground motions from the 1906 quake, to better understand the distribution of shaking and damage along more than 480 kilometers of the San Andreas fault.  The results of these investigations⁵ could help U.S. scientists develop early warning systems like those of other countries.

1 uncommon   

adj.罕见的，非凡的，不平常的

参考例句：

• Such attitudes were not at all uncommon thirty years ago.这些看法在30年前很常见。
• Phil has uncommon intelligence.菲尔智力超群。

2 sensors   

n.传感器，灵敏元件( sensor的名词复数 )

参考例句：

• There were more than 2000 sensors here. 这里装有两千多个灵敏元件。 来自《简明英汉词典》
• Significant changes have been noted where sensors were exposed to trichloride. 当传感器暴露在三氯化物中时，有很大变化。 来自辞典例句

3 scenario   

n.剧本，脚本；概要

参考例句：

• But the birth scenario is not completely accurate.然而分娩脚本并非完全准确的。
• This is a totally different scenario.这是完全不同的剧本。

4 killing   

n.巨额利润；突然赚大钱，发大财

参考例句：

• Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
• Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。

5 investigations   

（正式的）调查( investigation的名词复数 )； 侦查； 科学研究； 学术研究

参考例句：

• His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查，但没有发现什么。
• He often sent them out to make investigations. 他常常派他们出去作调查。