Update: Seismic activity on June 24 - 5.6 magnitude earthquake near Redwood Valley, CA reported

MENDOCINO COUNTY, CA - A 5.6 magnitude quake occurred near Redwood Valley on Wednesday morning, according to the U.S. Geological Survey.

The USGS reported a tremor in the region at 8:10 a.m. The epicenter was about 7 miles north of Redwood Valley, at a depth of 5 miles.

Did you feel it?

If you noticed the earthquake, you can share your experience using the USGS Felt Report form. So far, the agency has collected 3946 online responses from people indicating they felt very strong shaking. Residents reported experiencing the quake in a number of cities, including Aptos, South Lake Tahoe, Oakdale and San Jose based on the USGS DYFI report.

Did you document the aftermath?

If you have documented the effects of the tremor, share your photos with us through our sacbee.com/customer-service/submit-photo.

Impact and estimated losses

Yellow alert for economic losses. Some damage is possible and the impact should be relatively localized. Estimated economic losses are less than 1% of GDP of the United States. Past events with this alert level have required a local or regional level response Green alert for shaking-related fatalities. There is a low likelihood of casualties. Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.

Structure information summary Overall, the population in this region resides in structures that are highly resistant to earthquake shaking, though some vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.

Earthquakes last week

During the past week, the area has experienced four quakes of magnitude 2.5 or above. The biggest, a 3.1 magnitude quake, was detected close to The Geysers on Jun. 20.

The four largest earthquakes nearby in the last week:

• 3.1, east-southeast of The Geysers on June 20
• 2.8, northeast of The Geysers on June 21
• 2.6, west-northwest of Cobb on June 22
• 2.6, west-northwest of Redwood Valley on June 18

What to know about earthquakes

Magnitude measures the energy released at the source of the earthquake, the U. S. Geological Survey says. It replaces the old Richter scale. Quakes between 2.5 and 5.4 magnitude are often felt but rarely cause much damage, according to Michigan Tech. Earthquakes below 2.5 magnitude are seldom felt by most people.

Earthquakes' sudden, rapid shaking can cause fires, tsunamis, landslides or avalanches. They can happen anywhere, but are most common in Alaska, California, Hawaii, Oregon, Puerto Rico and Washington, according to the Department of Homeland Security.

It is estimated that there are 500,000 detectable earthquakes in the world each year. 100,000 of those can be felt, and 100 of them cause damage.

What to do during an earthquake

If an earthquake strikes, it's best to protect yourself right away. Here are tips from experts:

If you're in a car: Pull over and stop. Set your parking brake.

If you're in bed: Turn face-down and cover your head with a pillow.

If you're outdoors: Stay away from buildings. Don't go inside.

If you're inside: Stay and don't run outdoors. Stay away from doorways.

The best way to protect yourself during an earthquake is to drop, cover and hold on, officials say. "Wherever you are, drop down to your hands and knees and hold onto something sturdy," officials say. "If you're using a wheelchair or walker with a seat, make sure your wheels are locked and remain seated until the shaking stops." Be sure to cover your head and neck with your arms, and crawl under a sturdy table if possible. If no shelter is available, crawl to an interior wall away from windows. Once under a table, officials say you should hold on with one hand and be ready to move with it.

"There can be serious hazards after an earthquake, such as damage to the building, leaking gas and water lines, or downed power lines," officials say. "Expect aftershocks to follow the main shock of an earthquake. Be ready to Drop, Cover, and Hold On if you feel an aftershock."

Source: The U.S. Geological Survey

This article was generated by the CA Earthquake Bot, software that analyzes structured information, such as data, and applies it to articles based on templates created by journalists in the newsroom. No human journalist was harmed in this experiment. You can report errors or bugs to mcclatchybot@mcclatchy.com.

This story was originally published June 24, 2026 at 8:16 AM.