A magnitude 5.2 earthquake occurred in northeastern San Diego County near Julian at 10:08 a.m. Monday, causing shaking that was felt as far northwest as Oxnard and as far northeast as Palm Springs, according to the U.S. Geological Survey.

The epicenter was 3 miles south of Julian and caused especially hard shaking there and in Ramona, San Diego Country Estates, Pine Valley, and Cuyamaca Ranch State Park, USGS said. Through 11:30 a.m. Monday, the quake had produced four aftershocks in the 3.0 to 3.9 range. Sequences of this kind rarely lead to much larger quakes.

There were no immediate reports of significant damage. The North County Transit District said on X that all of its trains were operation under a speed restriction because of the earthquake. They said riders should expect delays.

The temblor started 8.3 miles deep, immediately south of the Elsinore fault zone, one of the busiest seismic zones in California, according to the USGS. The earthquake is likely to be followed by many smaller aftershocks. The 190-mile long strike-slip fault extends from near the Mexican border to the northern end of the Santa Ana mountains near Los Angeles, USGS says. The fault, which is capable of producing a quake as high as 7.5., faults through part of San Diego County.