An earthquake with a magnitude of 4.3 rocked the San Francisco Bay Area in the early morning hours, waking many – with more 24,000 saying they felt it – according to the United States Geological Survey.

The earthquake was just east-southeast of Berkeley, the survey said. It happened shortly before 3am PDT.

People posted online that they felt their homes shake. A few stores in Berkeley had minor damage, like a broken window or some merchandise falling off shelves.

Bay Area Rapid Transit posted on X that trains were running at reduced speeds as it completes safety track inspections. It told commuters to expect delays of up to 20 minutes system-wide.

"While 911 received an increase in calls from people who felt shaking, there have been no reports of injuries in San Francisco at this time, the city's Department of Emergency Management posted on X.

The department said it has not received any major damage reports.

San Francisco Mayor Dan Lurie posted online about the quake, saying "first responders are assessing any impact to our city, and we will give an update later today."

"Things were shaking in our newsroom," posted Dave Clark, a news anchor for KTVU-TV.  "It caught everyone off guard."

News stations reported that people as far south as Salinas, about 100 miles (161 kilometres) from Berkeley, felt it.

"As far as earthquakes go, this is kind of the ones where people feel them, but there's not a whole lot of impacts to them," said Brayden Murdock of the National Weather Service in Monterey.