Just had an earthquake in Corsica. The population wipe was devastating (90% iicr) but then I was stuck with a modifier for I believe 5 years (if I paid like 700 gold, which in early game is not easy money) or 10 years (if I didn't pay) that was -3% to population, which essentially guaranteed the cities affected (there were 2) was toast, so I had to abandon them.
Seems pretty harsh, I think the quake is probably bad enough, and perhaps a 1 year or less modifier RE population growth, and even 3% is overwhelming for the game and total overkill. To add insult to injury I had an event 10 years after the modifier wore away that took away 50 Civic power (by far the most rare nowadays) in memory of the tragedy.
Just mean, man.