Scrolling down in your link came to 4 min video....
“The video features USGS geologist George Plafker who, in the 1960’s, correctly interpreted the quake as a subduction zone event. This was a great leap forward in resolving key mechanisms of the developing theory of plate tectonics.”
Didn’t hear of plate tectonic theory until some years later.
The mid-1960s was when the "plate tectonics revolution" revived Wegener's Continental Drift claim.