The quake struck 8.3 miles deep near the Elsinore fault zone, one of the busiest seismic areas in California and part of the famous San Andreas fault system .

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.