ANCHORAGE, Alaska—
A tsunami warning for southern Alaska and northern British Columbia has been downgraded to an advisory, while a warning has been issued for Hawaii.
In addition, the West Coast and Alaska Tsunami Warning Center says parts of coastal Oregon and Northern California have been placed under a tsunami advisory.
The alerts came after the U.S. Geological Survey said a 7.7-magnitude earthquake hit in the Queen Charlotte Islands area Saturday night.
A tsunami warning means an area is likely to be hit by a wave, while an advisory means an area could be hit.
A small tsunami was barely noticeable in the small community of Craig, Alaska, where a four-inch wave was recorded.
The warnings had been sparked by a strong earthquake Saturday night off the west coast of Canada. The U.S. Geological Survey said the 7.7-magnitude earthquake hit in the Queen Charlotte Islands area, followed by a 5.8-magnitude aftershock several minutes later.
The National Weather Service issued a warning for coastal areas of southeast Alaska including Craig. The U.S. Coast Guard in Alaska tried to warn everyone with a boat on the water to prepare for a potential tsunami.
Also included in the original warning were Northern California, Oregon and Washington state. An advisory on the website of the Pacific Tsunami Warning Center said coastal areas of Hawaii would also see small changes in sea level and strong or unusual currents for several hours after 10 p.m. Hawaii time, Bloomberg News reported.
Bill Knight at the West Coast and Alaska Tsunami Warning Center said any forecast that includes waves of 1 foot to 3 1/2 feet qualifies for an advisory threat level, which does not mean a full-fledged evacuation.
"It does mean pulling back from harbors, marinas, getting off the beach," Knight said.
The state Department of Homeland Security and Emergency Management activated its emergency operations center and notified officials in southeast Alaska communities.
Lt. Bernard Auth of the Juneau Command Center said the Coast Guard was also working with local authorities to alert people in coastal towns to take precautions.
Lucy Jones, a USGS seismologist, said the earthquake likely would not generate a large tsunami.
"This isn't that big of an earthquake on tsunami scales," she said. "The really big tsunamis are usually up in the high 8s and 9s."
She said the earthquake occurred along a "fairly long" fault -- "a plate 200 kilometers long" in a subduction zone, where one plate slips underneath another. Such quakes lift the sea floor and tend to cause tsunamis, she said.
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