ANCHORAGE, Alaska -- A 7.0-magnitude earthquake has rocked buildings in Anchorage, the U.S. Geological Survey says.
A tsunami warning was issued but has since been canceled.
The are numerous reports of damage coming in.
A magnitude of between 7.0 and 7.9 is considered a major earthquake that will cause serious damage.
The US Geological Survey has reported at least four aftershocks following the first quake. The largest, registering 5.8, was located in the city of Anchorage.
Social media images depicted scenes of chaos, including students taking shelter under desks while sending texts from their phones, roads that had been buckled, items tumbling from grocery store shelves, hospital workers scrambling for cover and shards of broken glass outside buildings.
Gov. Bill Walker issued a disaster declaration, according to a post on his Facebook page.
There were no reports of fatalities or injuries so far.
The Anchorage Office of Emergency Management urged residents to shelter in place.
"I could tell this was bigger than anything I'd been in before and it wasn't going to stop," resident Philip Peterson said.
Peterson was in a multistory building in downtown Anchorage as the structure swayed and coffee mugs fells from tables and tiles from the ceiling.
"I just jumped under my desk and had to ride it out," Peterson said.
Michael West, the Alaska state seismologist, told CNN the 7.0 earthquake was felt up to 400 miles outside of Anchorage. West said damage reports across the region are just now beginning to arrive at the Alaska Earthquake Information Center.
The White House said via Twitter that President Donald Trump, who is in Argentina, had been briefed on the disaster.
Former Alaska governor and vice presidential candidate Sarah Palin tweeted that her house is not intact after the quake, but did not elaborate on specific damage.
"[Pray] for Alaska. Our family is intact -- house is not... I imagine that's the case for many, many others. So thankful to be safe; praying for our state following the earthquake," she said on her verified Twitter account.
The Dena'ina Civic and Convention Center in downtown Anchorage was opened as a safe shelter for people unable to get home.
Two of the city's main hospitals -- Alaska Regional and Providence Alaska Medical Center -- sustained damage during the quake, according to hospital officials.
The Anchorage Police Department said in a statement that it was handling "multiple situations" and reported "major infrastructure damage" across the city.
International Airport Road near Ted Stevens Anchorage International Airport has been damaged, the airport said via Twitter, advising motorists to use extreme caution.
Ted Stevens Anchorage International Airport also tweeted Friday that the airport is open despite the earthquake.
Blair Braverman said she was staying in a hotel with her husband when the quake hit. She grew up in California and was familiar with earthquakes "but this was next-level," she said.
"The bed started shaking, everything was shaking so dramatically," she told CNN.
"My husband sort of crawled across the room and threw himself on top of me and we crawled to the bathroom together and waited it out in the doorway and waited out the aftershocks."
KTUU was knocked off the air due to the earthquake. News director Tracy Sabo told CNN the station has had reports of items falling off shelves.
Reporters at KTVA described falling window panes and other damage at the station's offices.
"The structure of the roof just collapsed," one of them said. "We can't even get into our studio right now. There were computers flying, cameras toppling over."
The same area was hit by a 9.7-magnitude earthquake on Good Friday, March 27, 1964.