FILE - This Sept. 13, 2011 file photo shows a computer replication of the 6.7 magnitude Northridge Earthquake of 1994 during a demonstration of an early earthquake warning system at the California Institute of Technology in Pasadena, Calif. Developers testing an earthquake early warning system for the West Coast say its alerts are ready to be used much more broadly, but not for mass public notification. U.S. Geological Survey official Doug Given told reporters Wednesday, Oct. 17, 2018 at Caltech that the ShakeAlert system has transitioned from a production prototype to operational mode. The system is being built for California, Oregon and Washington. (AP Photo/Reed Saxon, File)
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