The US Geological Survey has reported a magnitude 6.5 earthquake off the coast of Northern California
The quake occurred in the Pacific Ocean about 100 miles off the coast of Eureka at around 6:50 a.m. on Thursday.
The epicentre was 165km west of Ferndale, California, at a shallow depth of 10km ((6.2 miles) below sea level.
There were no immediate reports of injuries or damage and no tsunami warning was issued.
Earlier reports from the USGS said the earthquake was a magnitude 6.8
Two quakes of more than 4.0-magnitude have shaken California in the last week
On Wednesday a 6.5-magnitude quake in Indonesia killed more than 100 people.
In the US, the next ‘Big One,’ an earthquake of magnitude 7.0 or more, is generally expected along the San Andreas line.