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Largest earthquake

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Posted (edited)

This is from the University of Alaska Fairbanks, Alaska Earthquake Center.


The Chignik Earthquake occurred relatively close (about 45 miles) to the location of the M7.6 Simeonof Island Earthquake that ruptured July 21, 2020. The Chignik Earthquake seems to be related to the earlier earthquake; both occurred along the interface between the subducting Pacific and overriding North America plates, although the Chignik Earthquake was the deeper of the two. 

Edited by susieice
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Coastal regions did evacuate when tsunami warnings were issued, but returned when waves measuring 1 foot arrived onshore.


The largest Alaska earthquake since 1965 caused a tsunami warning and local evacuations along the southwest Gulf of Alaska coast late Wednesday. After tsunami waves of less than 1 foot arrived onshore, the warning was canceled and coastal residents returned home.


The earthquake, with a preliminary magnitude of 8.2, according to the U.S. Geological Survey, hit at 10:16 p.m. at a depth of 20 miles. It was centered 65 miles offshore of the Alaska Peninsula village of Perryville.


It triggered tsunami warnings from Samalga Pass in the Aleutians to Prince William Sound. A tsunami advisory was in effect for the rest of Alaska’s coastline, including Southeast Alaska and the western Aleutians, and Hawaii was briefly on alert. Tsunami alerts for the rest of the North American west coast were also canceled.

There were no immediate reports of injuries or major damage, but the shaking was remarkable, even for residents feeling their third major earthquake in 13 months.

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