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Earthquake rocks northern California Earthquake rocks northern California
(35 minutes later)
An earthquake with a magnitude of 6.0 has shaken northern California, reports the US Geological Survey.An earthquake with a magnitude of 6.0 has shaken northern California, reports the US Geological Survey.
The USGS said it struck at 03:20 local time (1020 GMT) four miles (6km) north-west of American Canyon, at a depth of 6.7 miles.The USGS said it struck at 03:20 local time (1020 GMT) four miles (6km) north-west of American Canyon, at a depth of 6.7 miles.
The site is 51 miles from Sacramento and about 30 miles north-east of San Francisco, where many Twitter users say it woke them up.The site is 51 miles from Sacramento and about 30 miles north-east of San Francisco, where many Twitter users say it woke them up.
There were no immediate reports of injuries or serious damage.There were no immediate reports of injuries or serious damage.
Twitter users contacted the BBC to share their experiences.
Sarah McLellan tweeted: "On 6th floor entire building swaying, shaking", while Matt Dyar said: "Major shaker. Stuff off shelfs. Broken glass. No house damage that is obvious."
Another Twitter user said: "I haven't felt one that big since the Northridge quake in the early 90s."