Japan already relies on a system that helps prevent industrial accidents and train derailments by sending warnings as much as a minute before the ground starts shaking. That much time could save lives after a major earthquake in California, but seismologists say a prototype system there lacks funding and has big gaps.
Source: http://www.npr.org/2013/12/26/257368726/west-coasts-early-warning-system-for-quakes-still-spotty?ft=1&f=1007
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