A strong earthquake was felt in Northern California on Thursday and authorities have issued a tsunami warning.
The quake struck at 10:44 a.m. west of Ferndale, a small town in Humboldt County near the Oregon border, according to the US Geological Survey.
It was felt as far south as San Francisco, where residents felt rolling motion for several seconds. It was followed by smaller aftershocks.
The San Francisco Bay Area Rapid Transit District, known as BART, has stopped traffic in all directions through the undersea tunnel between San Francisco and Oakland.
At least 5.3 million people in California were under a tsunami warning after the 7.0-magnitude quake, the US Geological Survey said in a yellow alert, predicting localized but minimal damage.
More than 1.3 million people lived close enough to the quake to have felt it, the USGS estimated.
In the Santa Cruz area, phones rang with a tsunami warning from the National Weather Service that read: “A series of powerful waves and strong currents may affect nearby coasts. You are in danger. Stay away from coastal waters . Move to higher ground or inland now. Stay away from the coast until local officials say it’s safe to return.”