A magnitude-4.6 earthquake struck northwest of Malibu, causing widespread shaking across Southern California. The quake, reported just before 2 p.m., originated 7 miles northwest of Malibu in the Santa Monica Mountains, triggering over a dozen aftershocks within an hour.

Seismologist Dr. Lucy Jones noted the robust aftershock sequence but reassured that the likelihood of a larger seismic event decreases over time.

Shaking was felt by an estimated 12 million people across the greater Los Angeles area, from the coast to inland regions like the San Fernando Valley, downtown LA, Riverside, Irvine, and Anaheim. Some weak to light shaking extended into north San Diego County.

Although Marla Dailey described it as a “major jolt” while working in a Thousand Oaks dental office, no significant damage was immediately reported. The Los Angeles Fire Department conducted a standard damage survey.

The U.S. National Tsunami Warning Center confirmed no tsunami threat. The quake possibly occurred on the Malibu Coast Fault, near populous areas like Pacific Palisades, Westwood, Beverly Hills, and Santa Monica.

The timing coincides with the anniversary of the deadly 1971 San Fernando earthquake, which caused widespread devastation and raised fears of dam collapse. Notably, a separate magnitude-5.7 earthquake on Hawaii’s Big Island occurred the same day but was unrelated to seismic activity in Southern California.