Good evening Bay Area, CA. Did you feel the magnitude 3.9 earthquake about 1 mile northeast of Millbrae at 6:38 pm? The #ShakeAlert system was activated. See: https://t.co/LGdzH69Ho9 @Cal_OES @CAGeoSurvey @ListosCA pic.twitter.com/4fgLvvFZXo

— USGS ShakeAlert (@USGS_ShakeAlert) October 28, 2023