Large earthquake strikes off Alaska coast, prompting tsunami warnings

A 7.5-magnitude earthquake struck off the coast of Alaska near midnight on Friday, the U.S. Geological Survey said, prompting tsunami warnings and advisories down the coast of Alaska and Canada's British Columbia.

All tsunami warnings, watches and advisories were later canceled, the West Coast and Alaska Tsunami Warning Center (of the National Oceanic and Atmospheric Administration) said.

The quake struck in the Pacific Ocean about 60 miles southwest of Port Alexander, Alaska, at a depth of about 6 miles at 11:58 p.m. local time (3:58 a.m. ET), the USGS said.

Initially, the USGS reported that the temblor had a magnitude of 7.7, but it later downgraded the quake's strength to 7.5.

The NOAA also issued tsunami advisories from the Washington state-British Columbia border to the north tip of Vancouver Island. They were later canceled.

According to the NOAA, a tsunami warning means "that a tsunami with significant widespread inundation is expected or is already occurring."

There was no danger of a tsunami hitting Hawaii, according to the NOAA's Pacific Tsunami Warning Center.