Moderate aftershock of last week’s magnitude 7.8 quake recorded off Alaska Peninsula

Updated: July 27, 2020 Published: July 27, 2020

All the large recent earthquakes on the Aleutian Subduction Zone, including the magnitude 7.8 in the “Shumagin Gap” that occurred July 21, 2020. (Graphic courtesy Alaska Earthquake Center)

A moderate earthquake, an aftershock of last week’s magnitude 7.8 quake off the Alaska Peninsula, occurred in the same region Monday, according to the Alaska Earthquake Center.

The center said Monday’s quake at 11:34 a.m. had a preliminary magnitude of 5.5 and was located at a depth of about 18 miles. It was centered about 80 miles from King Cove, where it was lightly felt, the center said. The King Cove Department of Public Safety sent a notice to residents stating that continued aftershocks were expected.

A magnitude 7.8 earthquake last Tuesday was centered in waters 65 miles south-southeast of the tiny community of Perryville, at a depth of 17 miles, according to the U.S. Geological Survey. It generated tsunami warnings that were canceled after the earthquake created a wave of a less than a foot.