Millions of residents across Northern California were jolted awake early Thursday after a moderate earthquake struck the San Francisco Bay Area, sending shockwaves through cities in the middle of the night.
The tremor, recorded at magnitude 4.6, hit at approximately 1:41 a.m. local time, according to the United States Geological Survey.
The earthquake was centered near Boulder Creek in the Santa Cruz Mountains, roughly 60 miles south of San Francisco.
Despite its moderate strength, the quake was widely felt across a large area, including:
- San Francisco
- Oakland
- San Jose and as far north as Petaluma
More than 25,000 people reported feeling the shaking, highlighting how far the tremor traveled.
The timing made the quake particularly startling.
Residents reported being woken by a sharp jolt with homes shaking for several seconds and items like books and dishes falling off shelves
Many also received Shake Alert notifications on their phones, although in some cases the alert came after the shaking had already begun.
So far, authorities say the impact appears limited. There have been no major injuries reported, no significant structural damage confirmed and minor incidents like broken household items.
Experts say the quake was relatively shallow, which can increase how strongly it’s felt—but its magnitude was not high enough to cause widespread destruction.
Seismologists warn that aftershocks are possible in the coming days. Around a 50%+ chance of smaller aftershocks with very low probability of a stronger follow-up quake.
As of early morning reports, no significant aftershocks had been recorded.
California sits along major fault lines, including the San Andreas Fault system, making earthquakes a regular occurrence.
While quakes of this size are not uncommon, events that strike overnight, affect densely populated areas and are felt across wide regions tend to attract widespread attention.
The overnight earthquake may not have caused major damage, but it served as a sharp reminder of the Bay Area’s seismic vulnerability.
For many residents, it was a few seconds of shaking.
For experts, it’s another signal that preparedness remains essential in earthquake country.
