An earthquake of 6.0 magnitude has been detected in northern California, the US Geological Survey said.
The quake's epicentre was eight km (five miles) northwest of the town of American Canyon in the San Francisco Bay area.
There were no immediate reports of damage.
More top news
Actress and campaigner tells ITV News the only way to end the trade in illegal ivory is for the West to stand up to Beijing.
Former chief inspector of South Yorkshire Police David Sumner says Liverpool supporters were not 'completely innocent'.
The Queen and Prince Harry have responded to a 'game on' from Michelle and Barack Obama in competitive Invictus Games videos on Twitter.