Posing as a nurse at the Fort Jameson Army training camp, Sabrina Duncan shared a drink with Doctor Conlan at the officer's club in order to get information. Hoping to make him open up and feel relaxed, she commended him on the recognition and awards he got for his work during the earthquakes in Costa Rica.
This took place in December of 1976, so I think it's most likely that she was referring to that day in 1974 when Costa Rica was struck by at least three large earthquakes:
EARTHQUAKES IN COSTA RICA
- M 6.2 - Feb 28, 1974
- M 5.2 - Feb 28, 1974
- M 4.7 - Feb 28, 1974
So this real-world catastrophe also happened in Toobworld......