The largest of the quakes was a magnitude-3.9 temblor that struck at 12:39 AM today just north of Hemet, about 85 miles (135 kilometers) east of Los Angeles. The U.S. Geological Survey says the quake occurred at a depth of 10 miles (16 kilometers).
Another minor quake struck 25 miles east of San Francisco near the city of Concord shortly after 7:30 AM. The USGS says it measured magnitude 3.5 and was 9 miles (15 kilometers) deep.
The USGS website recorded hits from many people in both regions who reported feeling the jolts and characterized them as "weak" or "light." Both areas also had smaller aftershocks. Quakes of such magnitudes are generally too small to cause problems.