The risks are growing, experts say, as populations in poor regions continue to rise and the world, rich and poor, shifts ever more toward urban centers, many with well-charted seismic threats.

• 专家们说，随着穷困地区的人口不断上升，随着人口越来越集中到城市中心，许多地方都成为地震高危害区，风险正在增长。