Northern California's worst quake in 25 years injured at least 170 people and caused an estimated 1 billion dollars in damages, dpa cited the Los Angeles Times as reporting on Monday.
The 6.1 magnitude quake struck north of San Francisco early Sunday, leaving thousands without power and water service.
The United States Geological Survey (USGS) said it was the strongest earthquake in the San Francisco Bay area since 1989's 6.9-magnitude Loma Prieta quake, which caused major infrastructure damage.
The earthquake struck at 3:20 am (1020 GMT) at a depth of 10.8 kilometres. The epicentre was 9 kilometres south-west of the Napa wine region and 81 kilometres north of San Francisco.
In the town of Napa, a commercial centre for the wine industry, several historic buildings were badly damaged.
Fire officials blamed leaks from damaged gas lines for at least six major blazes that broke out immediately after the quake. Broken water mains hampered firefighters responding to the blazes.