4.3-magnitude earthquake rocks San Francisco Bay Area early Monday

A magnitude-4.3 earthquake struck the San Francisco Bay Area early Monday, waking residents and prompting safety inspections. The U.S. Geological Survey said the quake occurred shortly before 3 a.m. PDT, just east-southeast of Berkeley. More than 22,000 people reported feeling it, according to the agency. There were no immediate reports of injuries or significant damage.

AP reported that people as far south as Salinas, roughly 100 miles from Berkeley, felt the tremor. Social media posts from residents and local broadcasters indicated homes and offices swayed during the shaking, with several stations noting spans of movement across the region. In the immediate aftermath, Bay Area Rapid Transit said trains were running at reduced speeds as crews completed safety track inspections, with systemwide delays of up to about 20 minutes anticipated.

San Francisco Mayor Dan Lurie posted online that first responders were assessing any impact to the city and that an update would follow later in the day. A KTVU-TV anchor, Dave Clark, described the tremor from the newsroom: “Things were shaking in our newsroom. It caught everyone off guard.” The reports from the Bay Area suggested a broad, though moderate, impact, with no confirmed injuries or major structural damage in the early hours after the quake.

Officials emphasized that residents should stay informed through official channels as investigators review potential effects across communities. The San Francisco Bay Area sits on multiple fault lines, and small earthquakes are not uncommon, though the magnitude and location in this instance prompted swift checks of critical infrastructure and public safety systems. Authorities cautioned the public to remain vigilant for any further seismic activity and to follow updates from city and regional agencies as more information becomes available.