A strong earthquake centered in San Diego County gave Southern California a rattle on Monday morning. According to preliminary reports from the U.S. Geological Survey, the quake measured a magnitude of 5.2; that number may change as the USGS gathers more accurate data.

The 5.2 quake was centered near Julian. There were no immediate reports of major damage or injuries but some residents reported feeling a strong jolt.

A 5.2-magnitude earthquake shook Southern California on Monday morning, sending boulders tumbling onto rural roadways outside San Diego, items rattling off shelves and elephants at the San Diego Zoo Safari Park scrambling to encircle their young.