June 15, 2010 at 8:25 AM EST - Updated June 20 at 2:26 PM
CALIFORNIA (CNN) - A moderate earthquake rattled Southern California Monday evening, just north of the Mexican border, the U.S. Geological Survey reported.
The magnitude 5.7 quake stuck at 9:26 p.m. PT and was centered 70 miles east of San Diego, California. At least 20 other quakes shook the border region in an hour's time, measuring between magnitude 2.6 and 3.9.
Authorities throughout Southern California reported no damage in the immediate aftermath of the earthquake.