By Marian Smith, NBC News
Updated at 6:17 a.m. ET: 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.
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A?6-inch rise in sea level?was reported in Port Alexander, but there were no early reports of damage.
A tsunami warning was issued for the coastal areas of British Columbia from the north tip of Vancouver Island to Cape Suckling, but it was later canceled.
"A tsunami was generated by this event but does not pose a threat to these areas," the NOAA said in a statement. "Some areas may see small sea level changes. The decision to re-occupy hazard zones must be made by local authorities."
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.
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