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Metro has installed ShakeAlert earthquake early warning system at all bus and rail divisions | The Source
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Bay Area resident weighs in on effectiveness of ShakeAlert during Delta earthquake - CBS San Francisco
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ShakeAlert—Using GPS to Enhance the Earthquake Early Warning System- Incorporated Research Institutions for Seismology
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Metro has installed ShakeAlert earthquake early warning system at all bus and rail divisions | The Source
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Californians rattled awake by early-morning ShakeAlert earthquake warning messages – Orange County Register
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