Image Source: ABC7 Bay Area
An earthquake with a preliminary magnitude of 3.5 struck north of Santa Rosa Thursday morning, according to the U.S. Geological Survey. The shaking was reported at approximately 10:33 a.m. on September 3, 2026, in Sonoma County.
The earthquake was measured at a depth of 7.4 kilometers, or about 4.6 miles below the surface. While the event was relatively modest, its location near populated communities prompted residents to report feeling their homes shake.
Earthquake Strikes Near Larkfield-Wikiup
The USGS placed the earthquake roughly two miles east-southeast of Larkfield-Wikiup, an unincorporated community located about four miles from Santa Rosa. The area is part of the North Bay, a region with a long history of seismic activity.
Some people described feeling shaking inside their Santa Rosa residences in social media posts. Initial reports did not indicate injuries or significant property damage. Authorities and earthquake monitoring agencies continued reviewing information as details developed.
ABC7 Bay Area reported that Bay City News contributed to the initial coverage. The USGS location and magnitude information may be revised as additional seismic data are analyzed.
What the 7.4-Kilometer Depth Means
Earthquake depth can influence how strongly shaking is felt at the surface. In general, an earthquake that begins closer to the ground surface can produce more noticeable shaking and may have a greater potential to cause damage in nearby areas.
However, the level of shaking also depends on several factors, including the earthquake’s magnitude, distance from the epicenter, local soil conditions and the type of construction in surrounding communities. A magnitude 3.5 earthquake is typically felt by some people near the epicenter but is not expected to cause widespread damage.
Residents who felt the event were encouraged to remain alert for official updates rather than relying on unverified online reports. Earthquake information can change during the first hours after a seismic event as scientists refine the location and strength.
Why This Earthquake Matters for the North Bay
The latest earthquake comes as attention remains focused on earthquake risk across the San Francisco Bay Area. Researchers and emergency officials have repeatedly urged residents to prepare for a stronger earthquake, even though the timing of a major event cannot be predicted.
The Bay Area is crossed by several active faults, and seismic activity can occur in communities far from the region’s best-known fault lines. Smaller earthquakes such as Thursday’s event can serve as a reminder that preparation should happen before the ground begins to move.
Residents can take several practical steps to improve earthquake readiness:
- Secure bookcases, televisions and other heavy objects to walls.
- Keep emergency water, food, flashlights, batteries and first-aid supplies available.
- Learn how to shut off gas, water and electricity if necessary.
- Choose safe locations away from windows and falling objects.
- Create a family communication plan for situations when phone service is disrupted.
What to Do During Strong Shaking
Emergency specialists generally recommend the “Drop, Cover and Hold On” approach. Drop to the ground, take cover beneath a sturdy table or desk if possible, and hold on until the shaking stops. People indoors should avoid running outside during the earthquake, since falling glass, bricks and other debris can create additional hazards.
After shaking ends, residents should check for injuries, watch for broken glass and damaged utilities, and follow instructions from local authorities. People in areas affected by a larger earthquake should also be prepared for aftershocks.
For now, the magnitude 3.5 earthquake near Santa Rosa remains a developing story. No injuries were reported in the initial update, and no major damage was immediately identified. Officials will continue monitoring the area for additional seismic activity and updated measurements.
Frequently Asked Questions
Where did the earthquake occur?
The earthquake struck roughly two miles east-southeast of Larkfield-Wikiup, near Santa Rosa in Sonoma County.
How strong was the earthquake?
The USGS reported a preliminary magnitude of 3.5. The magnitude may be adjusted as scientists review additional data.
How deep was the earthquake?
The earthquake occurred at a reported depth of 7.4 kilometers below the surface.
Were there injuries or major damage?
No injuries or significant damage were reported in the initial coverage. Some residents said they felt shaking inside their homes.
