A major earthquake shook buildings in Anchorage, causing lanterns and trees to sway, causing the offices to run out and seek shelter under the office tables.
The US Geological Survey said the magnitude of the earthquake was 7.0. after an initial strength of 6.7.
The National Tsunami Warning Center issued a tsunami warning for the coastal areas of southern Alaska. The center said Friday that the warning applies to parts of Cook Inlet and the southern Kenai Peninsula.
The warning means tsunami waves are expected.
According to USGS, the Friday morning earthquake was centered about 12 kilometers north of Alaska's largest city.
An Associated Press reporter who worked in downtown Anchorage saw cracks in a 2-story building after the quake. It was unclear if there were any injuries.
People returned to the building after the earthquake, but a minor aftershock of 5.8 sent them back to the streets a short time later.
In Alaska, there are an average of 40,000 earthquakes per year, with more major earthquakes than in the other 49 states.
In South Alaska, there is a high earthquake risk as tectonic plates pass under the region. According to the US Geological Survey, the Pacific plate slips to the northwest and dips below the North American plate in southern Alaska, the Alaska Peninsula and the Aleutian Islands.
On March 27, 1964, Alaska was hit by a magnitude 9.2 earthquake. the strongest in US history, about 120 kilometers east of Anchorage. The quake, which lasted about 4 ½ minutes, and the tsunami it triggered claimed about 130 casualties.
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