I can't remember back that far.
One of my favorite SF short stories involves a geologist making a breakthrough, and prediciting exactly WHEN ‘California would break off & fall into the sea’.
People headed east, and then just before the big event, he makes the announcement that he was wrong, and California wasn’t going to drown after all.
Pressed by reporters, he told them, as he stepped back to the WEST side of the fault, “oh, no the quake will happen; I just got a sign wrong in the equations. California will remain; the REST of the country will sink!”