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.

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.

An earthquake with a 5.2 preliminary magnitude was reported near Julian, California on April 14, according to the U.S. Geological Survey. Several aftershocks of lesser magnitudes were also recorded in the area located roughly 60 miles northeast of San Diego, starting shortly after 10 a.m. local time.