The 1960 Chilean earthquake is the largest earthquake that has been measured on a seismograph , reaching 9.5 magnitude on 22 May 1960 . Its epicenter was near Cañete , Chile . The energy released was approximately twice that of the next most powerful earthquake , the Good Friday earthquake ( March 27 , 1964 ) which was centered in Prince William Sound , Alaska . The ten largest recorded earthquakes have all been megathrust earthquakes ; however , of these ten , only the 2004 Indian Ocean earthquake is simultaneously one of the deadliest earthquakes in history
1960 Chilean earthquake
1960 Valdivia earthquake
Earthquake