The warning of a tremor that could kill more than 320,000 people is forcing Japan to think of the abstract danger of disaster in more concrete terms, says Gearoid Reidy for Bloomberg Opinion.To live in Japan is to live with the risk of a devastating earthquake at any time. Usually, however, people tend to view that threat in the abstract. It’s kind of like thinking about death - I know I’ll die someday, but I hope it won’t be today. And so far, at least, I keep getting lucky. Until we don’t. Thursday’s announcement from Japanese authorities, warning of an...