Tsunami warning cancelled after 7.8 magnitude earthquake hit 75 miles south of Chignik

Jul 22, 2020

NOAA’s National Tsunami Warning Center cancelled the tsunami warning shortly after midnight. It reported a 24-centimeter wave at Sand Point.

 

Screengrab of NOAA's U.S. Tsunami Warning System, showing no warnings 14 hours after the quake hit around 10:15 p.m on July 21.
Credit NOAA Tsunami Warning Center

A 7.8 magnitude earthquake hit 75 miles south of Chignik late last night, according to NOAA's National Tsunami Warning Center, which reported a depth of 8.1 miles. NOAA cancelled the tsunami warning originally issued for the event shortly after midnight; it reported a 24-centimeter wave at Sand Point.

 

The U.S. Geological Society says the earthquake occurred "as the result of thrust faulting on or near the subduction zone interface between the Pacific and North America plates."

 

USGS added that since 1900, there have been six earthquakes that were magnitude 7 or greater near last night’s earthquake. The largest was an 8.2 magnitude quake in November of 1938, which occurred in almost the exact location of last night’s event.

 

If you felt the earthquake and want to give your perspective, call KDLG at 907-842-2200.

 

Contact the author at isabelle@kdlg.org or 907-842-2200.

 

 

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