4.2 earthquake off Malibu rocks Los Angeles

Los Angeles County was rocked early Wednesday morning after a 4.2 magnitude earthquake struck 10 miles off Malibu, according to the US Geological Survey.

The initial earthquake was reported at 2 a.m. A magnitude 3.5 aftershock hit just three minutes later, followed by a magnitude 2.8 at 2:22 a.m. and a magnitude 2.6 at 2:38 a.m., the USGS said. The first earthquake occurred at a depth of about nine miles.

“This morning’s M4.2 earthquake off the coast of Malibu reminds us that we live in #earthquake country,” the LA County Emergency Management Office said in a tweet.

There was no tsunami threat, according to the US National Tsunami Warning Center.

The Los Angeles Fire Department went into “full earthquake mode” and conducted a citywide assessment early Wednesday morning. No injuries or damage were reported and the agency has resumed normal operations, the LAFD said on its website.

The quake was felt as far north as Oxnard and as far south as Long Beach, the USGS quake map showed. The California Governor’s Office of Emergency Services said in a tweet that an emergency alert from the MyShake app, an earthquake early warning system, had been sent to residents, warning them that an earthquake was expected and that they had to stop, fall and take cover.

The alert reached 62,000 phones, said Richard Allen, a seismologist and director of the UC Berkeley Seismological Laboratory, which built the app.

Los Angeles residents reported on social media that they were surprised by the wave of tremors.

“Wow. That was huge,” actor Josh Gad tweeted.

Jenise Spiteri, Olympic snowboarder, said on Twitter it was the “biggest I’ve felt in a long time”.

Other residents said they were jolted awake, and some have reported sleep during the event.

According to a recent three-year sample of data, an average of 25 earthquakes of magnitudes 4.0 and 5.0 occur each year in California and Nevada.

Did you feel that earthquake? Consider reporting your feelings to the USGS.

Find out what to do before and during an earthquake near you by signing up for our Unshaken newsletter, which breaks down emergency preparedness into small steps over six weeks. Learn about earthquake kits, the apps you need, top tips from Lucy Jones and more at latimes.com/Unshaken.

Times writer Henry Chu contributed to this report.

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