1: What 's different this time from 1934 is the size and density of Kathmandu , which suffered the brunt of damage in both earthquakes . 2:  When you get a vast population in the kind of building infrastructure that is n't equipped to handle shaking of an earthquake this size , that 's when you see the scale of disaster we 're seeing now .  3: Population density , weak building infrastructure amplified damage , USGS spokesman says .
1: size and density of Kathmandu 2: a vast population 3: Population density