Monday's 5.2 magnitude temblor marked another success for California's early earthquake warning system, with users in some areas saying they got notifications on their phone before they felt shaking.

An earthquake with a preliminary magnitude of 5.2 hit Southern California on Monday morning. Experts with the Seismological Laboratory at the California Institute of Technology said the quake was recorded at 10:08 a.m. PT near Julian, California.

A moderately strong, 5.2-magnitude earthquake struck in Southern California on Monday, according to the United States Geological Survey. The temblor happened at 10:08 a.m. Pacific time about 2 miles south of Julian, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 6.