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 increased risk of a long-feared megaquake, forced citizens to consider the very real and immediate danger of an event that would devastate the country and upend life as we know it.