Two earthquakes rattled Northern California early in the morning. One was a shallow 2.6-magnitude tremor near Cobb in Lake County, and the other was a stronger 4.6-magnitude quake centered in Boulder Creek.
The shaking spread across the North Bay. Marin County residents—from San Rafael to Mill Valley and beyond—felt the tremors.
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This blog post covers what happened and what scientists know so far. Marin communities should stay alert, since aftershocks could still happen.
Two Northern California Quakes in One Night: The Facts
The first quake hit at 12:52 a.m. near Cobb in Lake County. It had a preliminary magnitude of 2.6 and was pretty shallow, just under 1.5 miles deep, according to the U.S. Geological Survey (USGS).
Less than an hour later, at 1:41 a.m., another tremor struck near Boulder Creek, about 15 miles north of Santa Cruz. The Boulder Creek quake measured 4.6 in magnitude and was more than six miles deep, per USGS.
The stronger quake was felt across a wide area. Marin County residents reported shaking that reached San Rafael, and people as far as Santa Rosa in Sonoma County noticed it, too.
Officials said there were no reported injuries or structural damage from either event as of early reports. Still, the stronger quake woke people up and rattled windows in several communities.
A local resident said they hadn’t felt a quake that strong in about 30 years. Even for folks used to earthquakes in the North Bay, a 4.6 can still catch you off guard.
Local Impact and Marin County Reaction
The 4.6-magnitude event caused noticeable shaking across Marin. In San Rafael, residents described windows rattling and items shifting on shelves.
Nearby towns like San Anselmo, Mill Valley, Sausalito, Larkspur, and Corte Madera also felt the tremor to varying degrees as it rolled through the North Bay.
Authorities pointed out that, while the shaking was unsettling, there were no confirmed injuries or major property damage. Relief was pretty clear across communities from the coast in Marin to the wine-country foothills in Sonoma as neighbors checked on each other and started looking over homes and workplaces for safety.
In Marin’s towns—from Novato up north to the waterfront neighborhoods of Sausalito and San Rafael—local schools and businesses settled down once the initial shock faded. Some places still had crooked doorframes and shelves as aftershocks continued to ripple through the region.
What It Means for Marin County: Preparedness and Perspective
Even a moderate earthquake can throw off daily life in Marin. Hillside homes in Mill Valley and coastal properties in Tiburon sit right alongside the busy commercial areas of San Rafael and Novato.
This episode reminded everyone that being prepared is still crucial, especially with active fault lines nearby and the chance for aftershocks over the next days or weeks.
Residents should review safety plans, check emergency kits, and make sure heavy furniture is secured in places like Larkspur and Corte Madera. A quick home safety check—looking for gas leaks, water line issues, and cracked walls—can really help if another tremor hits soon.
- Drop, cover, and hold on during shaking to protect yourself from falling debris.
- Inspect living spaces for hazards after the tremor; if you smell gas, avoid open flames and gas and head outside if needed.
- Check on neighbors, especially seniors and families with small children in Marin City, Fairfax, and nearby areas.
- Secure heavy items in homes and workplaces across the North Bay—whether you’re in Marinwood or an upscale condo in Belvedere.
- Keep your emergency kit updated with water, food, flashlight, radio, and medications for quick use after a shake.
Stay Informed: How to Get Local Updates in Marin County
Local outlets like Patch and other Marin-focused news services encourage readers to sign up for alerts and newsletters. These updates help you stay in the loop about aftershocks and any safety advisories.
If you live in San Rafael, Novato, Mill Valley, San Anselmo, Tiburon, Sausalito, or Corte Madera, real-time alerts can make a real difference. They let you respond fast to aftershocks or new guidance from emergency officials.
As the morning unfolds, Marin County communities—whether at the farmers markets in San Anselmo or along the waterfronts in Sausalito—are still processing the tremors. Folks are already thinking about what comes next and how to recover.
Here is the source article for this story: 2 Tremblers Shook Northern California Within An Hour: Did You Feel Them?
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