PARKFIELD, California (AP) -- An earthquake with a preliminary magnitude of 5.9 struck central California on Tuesday and was felt as far north as San Francisco and Sacramento, according to the U.S. Geological Survey.
An aftershock of 5.0 magnitude struck four minutes later.
Police said there were no immediate reports of damage or injuries.
In nearby Redwood City, the quake delayed the murder trial of Scott Peterson after a juror reported feeling the tremors.
Thousands of people from throughout the state reported feeling the quake.
"It rattled everything hanging on the walls and the chandelier was swinging. It didn't do any damage to our house. There were two shakers, one right after the other," said Ben Brown, who lives in Paso Robles.
The earthquake, which struck at 10:15 a.m. (1715 GMT) was centered 9 miles (14 kilometers) south of Parkfield and 17 miles (27 kilometers) north east of Paso Robles, scene of an earthquake that killed two people in December 2003.
Parkfield, located on the San Andreas fault, is known as the earthquake capital of California.
