A STRONG earthquake of 7.0 magnitude had occurred off the coast of northern California, the US Geological Survey (USGS) said today.
The earthquake, which the USGS defines as "major" at that magnitude, occurred at 7.50pm on the West coast (1250 AEST today) about 10km deep in the Pacific Ocean.
A tsunami warning has been issued for coastal areas from the California-Mexico border to the northern tip of Vancouver in Canada, USGS said.
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