What we know:

• A strong 7.0 magnitude earthquake has struck off the coast of northern California, according to the US Geological Survey
• A tsunami warning was issued but has since been cancelled
• Multiple aftershocks have been reported since the initial earthquake, which struck about 11:00 local time (19:00 GMT)
• More than 10,000 people are without power in California’s Humboldt County
• No deaths or injuries have been reported as a result of the quake