The term 'overdue' is used because, as earlier posters explained, the probability of an earthquake actually increases the longer that it doesn't happen. But it

The term 'overdue' is used because, as earlier posters explained, the probability of an earthquake actually increases the longer that it doesn't happen. But it comes to hurricanes, I suppose the probability of them occurring does not increase if they don't happen (or we just don't know), and that's why we (generally) don't use the term overdue.