Earthquake happens almost very frequent but most of the time, it happens in places that there aren't a lot of people in it (that's why not a lot of developers build buildings there). I do agree that it can happen anytime but it can happen anywhere too. any country. earthquake hazard maps can be useful but, earthquake proof (or something like that) like those in Japan can really be helpful in those time. Not a lot of places adopt to them and I think that all buildings should be. There is another proposal about a "earth scraper" or something - compared to sky scrapers, this one is under the ground...