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3.7 magnitude earthquake rattles San Francisco Bay Area

A 3.7 magnitude earthquake shook the Bay Area on Friday. | Source: U.S. Geological Survey

A 3.7 magnitude earthquake jolted the San Francisco Bay Area Friday evening, causing minor public transit delays and rattling buildings throughout the region.

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.

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.

READ MORE: 34 Years After Loma Prieta, San Francisco Gears Up for World’s Largest Earthquake Drill

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.

SFO officials told The Standard that the Friday night tremor caused no delays or disruptions to air travel.

RELATED: 4.1 Magnitude Earthquake Rattles San Francisco From 65 Miles Away

In the aftermath of Friday’s quake, various Bay Area transit agencies issued alerts about delays as equipment was checked.

“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.”

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.

Jennifer Wadsworth can be reached at

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