Array
USGS says that a magnitude 7.0 earthquake has hit Northern California in Humboldt County.
A tsunami warning has been issued by the National Weather Service.
It was initially reported as a 6.6 quake but then was upgraded by USGS.
VIDEO: What to pack in your earthquake emergency kit
There were no immediate reports of any damage.
The earthquake was felt as far south as San Francisco, where residents felt a rolling motion for several seconds. It was followed by smaller aftershocks.
The San Francisco Zoo announced that guests have been evacuated and animals and staff are moving to higher ground after a Tsunami Warning was issued due to the quake in Humboldt County.
