Magnitude 4.6 Earthquake Shakes Bay Area

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A magnitude 4.6 earthquake struck the Bay Area at 1:41 a.m. on Thursday, with the epicenter located near Boulder Creek in the Santa Cruz Mountains. The quake caused shaking that lasted several seconds in many areas, though initial reports had placed the magnitude at 5.1 before it was revised downward. Beyond startled pets and a few broken dishes, there were no reports of widespread damage.

Why it matters

The Bay Area is situated on a complex network of faults, and the Santa Cruz Mountains are particularly prone to seismic activity. The region remains seismically active, and this latest quake serves as a reminder of the ever-present risk and the importance of earthquake preparedness.

The details

According to the U.S. Geological Survey, the magnitude 4.6 earthquake was centered near Boulder Creek in the Santa Cruz Mountains. Shaking was felt across a wide area, from San Francisco to Petaluma, with residents closer to the epicenter experiencing more direct impacts, such as a book falling from a shelf. The initial magnitude estimate of 5.1 was quickly revised downward as more data came in from seismic stations.

• The earthquake struck at 1:41 a.m. on Thursday, April 2, 2026.
• The USGS estimates a 60% chance of a magnitude 3.0 or higher aftershock within the next week.
• There is a 14% chance of a magnitude 4.0 or higher aftershock happening within the next seven days.

What’s next

Residents should be prepared for potential aftershocks, which can still be unsettling even if generally smaller than the initial quake. The USGS advises that magnitude 3 and higher aftershocks are large enough to be felt nearby, and it's a good time to review earthquake preparedness plans, including securing heavy objects and knowing what to do during an earthquake.