A 3.7 magnitude earthquake jolted the San Francisco Bay Area Friday evening, causing minor public transit delays and rattling buildings throughout the region.
UPDATE: All cable car service is will be temporarily delayed as cable cars staff conduct a safety check of the cable car system. https://t.co/l2VkGNTe0G
— SFMTA (@SFMTA_Muni) October 28, 2023
The quake at 6:38 p.m. was centered about a mile or two northeast of Millbrae, according to the U.S. Geological Survey. It initially clocked 4.1 on the Richter scale before getting downgraded to 3.9 and then 3.7.
Attention Passengers: An earthquake occurred within the area serviced by BART. Trains are running at reduced speeds while we complete safety track inspections. Please expect residual delays of up to 20 minutes systemwide.
— BART Alert (@SFBARTalert) October 28, 2023
It came just 10 days after the 34th anniversary of the Loma Prieta earthquake, nine days after the USGS reported a 4.1 magnitude quake with an epicenter in Isleton and just eight days since people ducked for cover in the world's largest earthquake drill.
The house was a rockin' here in Glen Park in San Francisco. #earthquake
— Sonia Mansfield (@TheSoniaShow) October 28, 2023
The San Francisco Department of Emergency Management said it has yet to field any reports of damage from the quake, which the ShakeAlert app registered as a 3.9 magnitude.
Did you feel it? Thankfully there are no reports of damage from this 3.9 quake in San Francisco, but it's a great reminder to do what we can now, before the next damaging earthquake. The good news is there are simple steps we can take now to be ready https://t.co/6URBxVIKsS https://t.co/ItXbhtg9fB
— San Francisco Department of Emergency Management (@SF_emergency) October 28, 2023
SFO officials told The Standard that the Friday night tremor caused no delays or disruptions to air travel.
A 4.0 magnitude earthquake occurred in Northern California. Details: https://t.co/usyTUDQIbu Map: https://t.co/Z2CjOXu3du
— SF QuakeBot (@earthquakesSF) October 28, 2023
In the aftermath of Friday's quake, various Bay Area transit agencies issued alerts about delays as equipment was checked.
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
"An earthquake has occurred within the area serviced by BART. Our procedures require trains to hold at stations for a short time before proceeding at a reduced speed to the next station," BART posted on their website. "This is a safety measure to ensure no structural damage has occurred. Normal train operations will resume as soon as possible."
Wow! Just felt an earthquake in San Francisco. I live in a very high rise in the city, not sure if it’s very safe. Did you guys feel anything? 😳 #SanFrancisco pic.twitter.com/6zSD8GrCyj
— Ann Marie Ruby | Author (@TheAnnMarieRuby) October 28, 2023
According to the San Francisco Municipal Transportation Agency, trains and buses will experience minor delays as staff go through safety-check protocols.
Posts on X, formerly Twitter, showed that users felt the earthquake as far as Antioch in the East Bay.
Bay Area rushing to twitter to tweet about the earthquake that just happened pic.twitter.com/9Ok4HpmUCx
— Ross Horiuchi (@RossHoriuchi) October 28, 2023