7.0-magnitude earthquake rattles Northern California

A 7.0-magnitude earthquake struck off the coast of northern California Thursday morning, about 40 miles west of the community of Petrolia, the US Geological Survey said.

​ A 7.0-magnitude earthquake struck off the coast of northern California Thursday morning, about 40 miles west of the community of Petrolia, the US Geological Survey said. Read More Breaking News, Latest News and Videos | CNN