Update: Seismic activity on Nov. 30 – 2.0 magnitude earthquake close to Calimesa, CA detected

RIVERSIDE COUNTY, CA – A preliminary 2.0 magnitude quake was recorded close to Calimesa Sunday morning, the U.S. Geological Survey reported.

The tremor, which struck the area at 5:47 a.m., was centered about 7 miles south-southwest of Calimesa. It occurred at a depth of 10 miles.

Did you feel it?

Those who felt the earthquake are encouraged to report it via the USGS Felt Report form.

Tremors past week

Last week, six tremors with a magnitude 2.5 or above have been registered in the region. The biggest, a 3.8 magnitude quake, rattled close to Idyllwild two days earlier.

Last week’s five largest nearby earthquakes:

• 3.8, southwest of Idyllwild on Nov. 27
• 3.5, southwest of Idyllwild on Nov. 27
• 3.0, southwest of Idyllwild on Nov. 28
• 2.6, south of Highland on Nov. 23
• 2.3, southwest of Idyllwild on Nov. 27

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 November 30, 2025 at 5:54 AM.