A preliminary 6.0-magnitude earthquake struck near San Diego, according to the U.S. Geological Survey. The quake's epicenter was recorded 1.86 northeast of San Diego County, in Julian. It is not yet known if there are reports of injuries or damage.

Heart-melting video shows African elephants at the San Diego Zoo instinctively forming a protective circle after the earthquake hit Southern California.

Ndlula, Umngani and Khosi — scramble to encircle and shield the two 7-year-old calves, Zuli and Mkhaya, from any possible threats.