Updated: BC quake prompts tsunami warning for SE Alaska

A tsunami warning was posted Saturday evening for the outer coast of Southeast Alaska from Cape Decision to to the tip of Vancouver Island, British Columbia.

Two earthquakes, magnitude 7.7 and 5.8, were reported near the Queen Charlotte Islands at about 7:04 and 7:14 Alaska time Saturday night. Several additional afterschocks were also reported Saturday evening and Sunday.

There were various reports by Juneau residents through social media that they felt the main quake with some shaking and swinging of hanging light fixtures, but no damage was initially reported.

Wave heights were reported at about four inches in Craig and Port Protection, about nine inches in Winter Harbour, B.C., and  two waves of about eight inches were detected at Langara Point.

Although Sitka was outside of the warning area, officials asked everyone to briefly leave the harbor area as a precaution. Juneau and other communities located within the inside waters of Southeast Alaska were not expected to see any significant change in water levels.

The tsunami warning for Alaska was eventually downgraded to an advisory and then cancelled late Saturday night. However, a tsunami warning was later posted for the Hawaiian Islands as propagation and travel maps indicated possible arrival of a wave there. A tsunami advisory for that area has since been cancelled after a five-foot wave was reported at Maui.

Matt Miller October 28, 201212:21 am

A report from our sister station KCAW in Sitka: Authorities are standing down after the tsunami warning was downgraded to an advisory.

Matt Miller October 27, 201210:27 pm

Tsunami warning has been downgraded to an advisory.

Matt Miller October 27, 201210:22 pm

The tsunami warning was issued for the area south of Cape Decision down to the tip of Vancouver Island.

Matt Miller October 27, 201210:21 pm

A 4.3 magnitude after shock was reported occuring at 10:15 in same location as the first two quakes.

Matt Miller October 27, 201210:12 pm

Our apologies. Our websites have been down for part of this evening…

Latest information from NOAA is that 4 inch wave heights were detected at Craig and Port Alexander, 6 inches in Winter Harbour BC. Two waves under 50 centimeters detected at Langara Island. Tsunami warning still in effect for outside coast of Southeast Alaska from Cape Decision and on south. Sitka residents are being warned to leave the harbor area as a precaution.

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