Tsunami warning issued for Southeast after 7.7 quake in British Columbia

October 27, 2012 

Update, 9:30 p.m.

 

The U.S. Coast Guard is warning people in far southern Alaska to take precautions after a tsunami warning was issued for coastal areas of Alaska and the Pacific Northwest. 

The warning was sparked by a strong earthquake Saturday night that shook 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 southern Alaska including the small communities of Craig and Sitka. The U.S. Coast Guard in Alaska said it's trying to warn everyone with a boat on the water to prepare for a potential tsunami. 

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. 

More information is available in a bulletin from the Tsunami Warning Center in Palmer.

 

  Update, 8:30 p.m.

The U.S. Coast Guard is warning people in far southern Alaska to take precautions after a tsunami warning was issued for coastal areas of Alaska and the Pacific Northwest. 

The warning was sparked by a strong earthquake Saturday night that shook off the west coast of Canada. 

The U.S. Geological Survey says 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 has issued a warning for coastal areas of southern Alaska, Northern California, Oregon and Washington state. It says the warning area includes Craig and Sitka. 

The U.S. Coast Guard in Alaska says it's trying to warn everyone with a boat on the water to prepare for a potential tsunami. 

Lt. Bernard Auth of the Juneau Command Center says the Coast Guard is also working with local authorities to alert people in coastal towns to take precautions. 

 

 

 

 

 


  Original story

 

The Alaska Tsunami Warning Center in Palmer issued a tsunami warning Saturday evening for Southeast Alaska and the British Columbia coast minutes after a strong earthquake struck the region.

The earthquake had a preliminary Richter Scale magnitude of 7.7 and struck at 7:04 p.m. Alaska time, the National Weather Service said. The epicenter was reported 25 miles south of Sandspit, British Columbia, or 390 miles southeast of Juneau.

The tsunami warning was issued in a bulletin at 7:07 p.m. for low-lying coastal areas from the north tip of Vancouver Island in Canada to Cape Decision in Alaska, some 85 miles southeast of Sitka.

More information is available in a bulletin from the Tsunami Warning Center in Palmer.

 

 

 

 

 

 

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