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Seconds before a 6.2 earthquake rattled California, phones got a vital warning | California | The Guardian
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Oregon Office of Emergency Management : Cascadia Subduction Zone : Hazards and Preparedness : State of Oregon
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Entire U.S. West Coast Now Has Access to ShakeAlert® Earthquake Early Warning | U.S. Geological Survey
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Chris McGinness on Twitter: "A Tsunami Advisory has been issued for the entire US West Coast due to volcanic activity and an earthquake in Tonga: 1-3' waves expected along the Washington &
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