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Warning system could alert West Coast 60 seconds before earthquake

You may have seen the pictures of Friday's magnitude 7.2 earthquake in Mexico. Cameras showed trees swaying and buildings collapsing.

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People who were participating in a Holy Week procession stop after a strong earthquake jolted Mexico City, Friday, April 18, 2014. A powerful magnitude-7.2 earthquake shook central and southern Mexico but there were no early reports of major damage or casualties. A warning system notified people in Mexico City of the impending earthquake about a minute before it happened. (AP Photo/Marco Ugarte)
Photo by Marco Ugarte
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