A powerful quake shook southern Alaska on Friday morning, buckling roads, disrupting traffic and knocking television stations off the air in the state's largest city, but there were no immediate reports of injuries.
Officials eventually canceled a tsunami warning for coastal areas of southern Alaska after the natural disaster.
Infrastructure in and around Anchorage took a major hit, police said on Twitter, with some homes and other buildings heavily damaged and many roads and bridges forced closed.
Senior center technician Michael Burgy says gauges are being monitored to determine if any underwater landslides have generated tsunami waves.
Walker says it will take more than a week or two to fix roads damaged by the quake.
Cracks could be seen in a two-story downtown Anchorage building.
Over the next three hours, the region saw at least 40 aftershocks, including 10 with magnitudes greater than 4 and three with magnitudes greater than 5, according to the Alaska Earthquake Center at the University of Alaska Fairbanks.
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However, according to local and national reports in the United States, roads have been torn apart, while airports and schools have been evacuated, with children being told to go home and planes ordered to find somewhere safer to land.
People reportedly started going back inside buildings after the first quake rocked, only to send them running back outside when a 5.8 aftershock hit. "Alaska does not trigger California quakes and vice versa".
Hank Graper says he was driving when the quake struck.
Graper called it the most "violent" quake he's experience in his 20 years in Anchorage.
Municipal Light & Power warned of possible downed power lines and said it was seeking to restore electricity to affected customers. The most powerful natural disaster in recorded USA history, a magnitude 9.2 quake, occurred in the state's Prince William Sound in 1964. "You could tell that it was a bad one". I imagine that's the case for many, many others. A ground stop held up flights coming into Anchorage's global airport.
2 p.m.: This article was updated with details about road damage.