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Before the earthquake in China’s Sichuan Province, 38-year-old Sarah Bexell was working to develop a...

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was happened   had happened   happened   had been happened  
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h has more quantity of sensitive electrical devices.  It can measure very small changes in the Earth’s surface.  Require less Human Resources.  More accurate on predicting site of earthquakes.  
It predicts only a short time before event.  It cannot tell exact location.  It predicts only earthquakes that happened daytime.  It predicts only low rate earthquakes.  
In Parkfield, the scientists noted changes two hours before the secured quakes shuck by the new system.  A system providing a signal ten hours before a major quake could help move people from the area and save lives.  The changes in air pressure on the Earth’s surface are caused by rocks’ pushing together.  It has been confirmed that the deeper the devices can go in the ground, the greater intensity earthquakes can be foun  
News  Information  Messages  Advice  
By measuring the seismic waves caused by rocks’ pushing together.  By observing animal’s behaviors.  By recording the changes of astronomical phenomena  Not mentioned  
Califomia  Sichuan, China  Osaka, Japan  San Andreas Fault  

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