AN EARTHQUAKE has struck off northern California in the Pacific Ocean.
The quake, with a magnitude of 5.8, was then followed by a second quake of 5.6 closer to shore.
The US Geological Survey said both quakes were very shallow.
The quake, which was later revised to a 5.7 magnitude, was felt about 6am UTC.
There have been no reports of injuries or damage.
Magnitude 5 quakes and above are not uncommon in seismically active California.
They are considered moderate and capable of causing considerable damage if they hit a heavily populated area directly.
But rarely do they cause problems when they strike offshore from the sparsely populated Mendocino coast.