Last Thursday inside Fire Station 6 in Menlo Park, California an alarm went off, followed by an announcement by the loudspeaker, “Earthquake Warning. Serve shaking expected in 30 seconds.” The new system was triggered by the 7.8 magnitude earthquake in Bodega Bay, California 64 kilometers away. The systems immediately opened doors, turned on emergency lights, and shut off gas burners

For more info, please read the original article by Spectrum :
https://spectrum.ieee.org/view-from-the-valley/at-work/start-ups/a-30-second-earthquake-warning-gives-a-menlo-park-fire-station