The U.S. Geological Survey says a magnitude-3.9 wquake struck at 6:34 a.m. off the San Diego County coast. It was centered 23 miles southeast of San Clemente Island and 67 miles west of San Diego.
Earlier, a magnitude-3.4 earthquake struck about 75 miles west of Sacramento. That 3:59 a.m. quake was centered near Cobb, about 2 miles northeast of The Geysers.
