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A powerful quake rocked Anchorage on Friday, violently shaking homes and businesses in Alaska's largest city and knocking out power to some residents.

There's a good reason for that. As Eric Sorensen reports, a powerful quake from decades ago has led to safer buildings that mostly withstood Friday's jolt. - The powerful natural disaster caused damage to homes and businesses and triggering a tsunami warning.

A magnitude 7.0 quake hit Anchorage, Alaska, on Friday, according to the National Weather Service. The children got on the ground in a circle while Lettow tried to keep them calm and watched for falling trees.

According to Earthquakes Canada, the quake struck about 22 kilometres east-southeast of Fort St. John just before 5:30 p.m. He said he wondered if Friday's quake "could be the one". But he's "really glad" they were in place as he only had minor water damage at his home.

Walker said sometimes people, including himself, grouse about stringent building codes.

The 7.0 magnitude earthquake's epicenter was 8.1 miles (13 km) north of Anchorage, home to about 40 percent of the state's population.

"These numbers can change by the minute, people can be expected to feel aftershocks for some time", Baldwin told CNN. There were no reports of deaths, serious injuries or structural damage to buildings.

The oil pipeline was shut down for hours Friday while crews were sent to inspect it for damage. "But we know that a tragedy of this magnitude is going to require outside resources", she said.

Aftershocks Saturday continued to fray nerves. "I kept waking up".

On March 27, 1964, Alaska was hit by a 9.2 natural disaster, the strongest recorded in USA history, centred about 75 miles (120 kilometres) east of Anchorage.

A video posted to Twitter showed a buckled road on a highway exit ramp leading to the airport and a stranded vehicle. More than a dozen were higher than magnitude 4 and a handful greater than magnitude 5, Falsey said.

"It was very loud when it came", Berkowitz said Friday.

"Building codes mean something", he said.

But the warning was withdrawn by the USA officials minutes later, The Associated Press said. We looked after one another.

Around 300,000 people live in Anchorage with 100,000 in the surrounding area. An incident command center has been established at Joint Base Elmendorf.

"It wasn't a situation where there was a mass rush of people", hospital spokesman Mikal Canfield said. Their building suffered only minor damage, but he says others were much worse.

When it finally ended, team member Sadie Blake, 15, said, "I started crying".

Roads didn't fare so well.

The Glenn Highway received damage in several areas north of Anchorage.

Roads and bridges appeared to have been hardest hit.

Rock falls exacerbated by hundreds of aftershocks are causing some problems on the Seward Highway south of Anchorage.

ANCHORAGE, Alaska Chris Riekena was driving his 7-year-old son to school when his auto started acting up. The trip is 350 miles (563 kilometers) each way. One was offloading barges as normal on Sunday, and the other company is scheduled to offload barges Monday after successfully testing their crane system.

The Ted Stevens Anchorage International Airport is open and operating at reduced capacity with delayed flights following back-to-back earthquakes.

The Anchorage School District canceled classes Monday and Tuesday to assess facility damage. This quake wasn't almost as strong so any tsunami is unlikely to reach that level, but this is still a unsafe situation and should be monitored closely if you live anywhere across the Pacific.

The reason Alaska sees so many earthquakes is because the 49th state sits over a major fault line between the Pacific and North American tectonic plates.