The epicenter of the "strong" quake was off the coast near Petrolia, in Humboldt County, the USGS said. Also, a tsunami warning that had been issued for coastal areas in California and Oregon ...

The 3.0 magnitude earthquake was recorded at 7:09 a.m. about 46 miles west-northwest of Petrolia, an unincorporated community in Humboldt County ... USGS's "Did You Feel It?" map.