UPDATE at 10:11 a.m.: The USGS has downgraded the quake to a magnitude 4.7.
ORIGINAL POST: A magnitude-5.2 earthquake shook parts of San Diego County Monday morning.
The quake, centered 12 miles southeast of Anza, struck at 9:55 a.m., according to the U.S. Geological Society.
The temblor follows a 2.9-magnitude quake that rocked the same area Monday at 9:36 a.m., the USGS reported.
