Alaska's largest city has been rocked by back-to-back earthquakes.
The tremors, measuring 7.0 and 5.8, hit on Friday from about 8.45am local time. They shook buildings and shattered roads in Anchorage.
The quake sent people running into the streets and briefly triggered a warning to flee to higher ground for fear of a tsunami. This warning was lifted shortly after.
There have been no reports of deaths or serious injuries. US president Donald Trump called it a "big one".
He tweeted: "To the Great people of Alaska. You have been hit hard by a “big one.”
"Please follow the directions of the highly trained professionals who are there to help you. Your Federal Government will spare no expense. God Bless you ALL!"
One image showed a car stranded on a sunken island of tarmac, surrounded by cavernous cracks where the earthquake split the road.
Cracks could be seen in a two-story Anchorage building, and photographs posted on social media showed fractured roads and collapsed ceiling tiles at a high school.
Cereal boxes and packages of batteries littered the floor of a grocery store, and picture frames and mirrors were knocked from living room walls.
People went back inside after the first earthquake struck, but the 5.8 aftershock about five minutes later sent them running back into the streets.
David Harper was getting some coffee at a store when the low rumble intensified into something that sounded "like the building was just going to fall apart". Mr Harper ran to the exit with other customers.
He said: “The main thought that was going through my head as I was trying to get out the door was: ‘I want this to stop.’”
In Kenai, north of Anchorage, Brandon Slaton was alone at home and soaking in the bathtub when the earthquake struck. Mr Slaton, who weighs 209 pounds, said it created a powerful back-and-forth sloshing in the bath. Before he knew it, he was thrown out of the tub by the waves.
Mr Slaton ran into his son's room after the shaking stopped, finding his fish tank shattered and the fish on the floor, gasping for breath. He grabbed it and put it in another bowl.
"It was anarchy," he said. "There's no pictures left on the walls, there's no power, there's no fish tank left. Everything that's not tied down is broke."
Alaska averages 40,000 earthquakes per year, with more large quakes than the 49 other states combined.
Southern Alaska, where Anchorage is, has a high risk of earthquakes because of tectonic plates sliding past each other under the region.
Additional reporting by Associated Press.
