Alaska has been struck by more than 1,000 aftershocks following Friday's 7.0 magnitude earthquake, the U.S. Geological Survey told CNN.

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Most of the aftershocks measured 2.5 or less, but the USGS said some 350 of the small quakes were higher and more than 10 were stronger than a 4.5 magnitude.

The temblor on Friday shook downtown Anchorage, Alaska’s largest city, damaging buildings and roads, and was centered about 8 miles north of the city.

An initial tsunami warning after the quake was canceled, and there were no serious injuries or deaths, but people were still frightened and described tense moments after the powerful quake.

Marty Thurman with Granite construction inspects a crack in the road at the International Airport Road offramp on southbound Minnesota Blvd., in Anchorage, Alaska, Friday, Nov. 30, 2018. A state official says Ted Stevens Anchorage International Airport is open and operating at reduced capacity with delayed flights following back-to-back earthquakes.

Credit: Loren Holmes

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Credit: Loren Holmes

Damage from an earthquake is seen on the Glenn Highway southbound lanes between Eklutna and Mirror Lake, in Alaska, Friday, Nov. 30, 2018. A 7.0 magnitude temblor hit on Friday morning. DOT project engineer Rod Cummings said the inbound lanes of the highway will be closed for several days, but the highway is open and inbound traffic will be routed around the area until crews can repair the damage.

Credit: Matt Tunseth

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Credit: Matt Tunseth