Gravitron has brought his little chunk of Canada to the big city!!
Anyway, in one of the saddest variations of "I have a girlfriend, but she's in Canada," well, Frank's Canadian scientist crush really exists, and kills herself rather than be forced to be Graviton's queen. Oops!
Now, I fear that some of your primitive post-1970s minds are whining "physics" or "tidal waves" or the like.
The Bullpen has you covered, friend:
From Avengers #159 (1977). Letter from Avengers #163 (1977)