Tsunami warning ended for southern Alaska after magnitude 7.8 earthquake

Tsunami warning ended for southern Alaska after magnitude 7.8 earthquake

By

Sean Boynton

Global News

Posted July 22, 2020 3:07 am

 
 

Updated July 22, 2020 4:28 am

The epicentre of a 7.8-magnitude earthquake off the coast of Alaska on July 22, 2020.

USGS


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A magnitude 7.8 earthquake off the southwestern tip of Alaska prompted a tsunami warning for some communities early Wednesday, which has since ended.

The quake hit roughly 100 kilometres southeast of Perryville, according to the U.S. Geological Survey, at a depth of about 28 kilometres.

Read more:
Magnitude 6.1 earthquake hits central California: U.S. Geological Survey

The tsunami warning issued by the U.S. National Weather Service covered the entire island chain stretching from the southern tip of the Alaska Peninsula. Some surrounding communities were placed under tsunami advisories, which were later lifted.

Tsunami warning sirens were heard in communities like Kodiak, according to videos on social media.

Tsunami warning in kodiak AK pic.twitter.com/pBio9lnWDF

— Tyler (@Tyler82092707) July 22, 2020

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Evacuations were observed in communities like Homer, with vehicles seen heading for higher ground.

pic.twitter.com/Pyf3SVYG0c

— 👹🕷Tat Daddy🕷👹 (@alaska_tattoo) July 22, 2020

The National Weather Service and other agencies later confirmed there is no tsunami threat for other U.S. and Canadian Pacific coasts.

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Just before 12:30 a.m. local time, the tsunami warning was cancelled for Alaska as well.

CANCELLATION: M7.8 075mi S Chignik, Alaska 2213AKDT Jul 21: Check with local officials for all clear

#NTWC

— NWS Tsunami Alerts (@NWS_NTWC) July 22, 2020

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Multiple smaller earthquakes struck the same area off Alaska shortly after the first, the largest of them measuring at a 4.8 magnitude.

There were no immediate reports of damage in the area.

Earthquakes Canada issued a warning of a 4.6-magnitude quake near Port Hardy, B.C., in relation to the first Alaska quake, but later admitted it was a false alarm.

FALSE ALERT *Magnitude 4.6 – 21 Jul 23:16 PDT – PORT HARDY, BC region* based on Alaska teleseism. For details see the https://earthquake.u

— Earthquakes Canada (@CANADAquakes) July 22, 2020

0:40
6.5-magnitude Idaho earthquake felt by B.C. residents

6.5-magnitude Idaho earthquake felt by B.C. residents

© 2020 Global News, a division of Corus Entertainment Inc.




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