Story at a glance

  • An 8.2 magnitude quake shook Alaska this morning near Perryville and Chignik.
  • Tsunami warnings were issued for both Alaska and Hawaii.
  • The quake was the strongest recorded in the U.S. in 50 years.

An 8.2 magnitude earthquake hit Alaska early Thursday morning, prompting the brief issuance of a tsunami warning that has since been recalled. 

The U.S. Geological Survey confirmed that the quake, which occurred on July 28 in local time, was centered in Perryville, south of the Alaskan Peninsula. Experts note that the earthquake occurred due to thrust faulting near the subduction zone interface between the Pacific and North American tectonic plates. 

This was the strongest earthquake to take place in the U.S. in 50 years

Since the larger 8.2 earthquake, aftershocks have hit the surrounding Perryville region, mainly near Chignik, Alaska. The largest aftershock was a 6.1 magnitude earthquake in Chignik. 

At least 268 residents have reported feeling some level of seismic activity. Other reports note that communities further from the epicenter, including those in the Mat-Su Valley in Southcentral Alaska, felt shaking.

Since the quake struck a coastal area, a tsunami advisory was issued for the Alaska Peninsula and 75 miles southeast of Chignik, but the advisory was lifted. A corresponding tsunami warning was issued for Hawaii, which was ultimately canceled, per state Governor David Ige (D).  

Larger-magnitude earthquakes are common along the Alaska-Aleutian subduction zone. The U.S. Geological Survey notes that since 1900, there have been eight other earthquakes that recorded more than a 7-level magnitude.  

Published on Jul 29, 2021