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Building
Different buildings have different reactions to earthquake according to its material, structure, heights,etc,. Most of them are determined by its construction period because at different time, the building code is different. The quality of construction technic is very important. Moreover, old buildings barely use any engineering technics to survive a earthquake. They are build in bricks which is heavy and very easy to collapse.
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Human ability
When earthquake happens, how individual person react determined their survive chance. How much people is educated when facing earthquake; How fast can people move to the safety place;etc;. These all are factors of whether one is more likely to survive. In addition, the population number of certain area determines how many people will be affected by earthquake, which is also an important factor.
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Emergency Rescue
When people get injuered, how fast and well are they treated is another factor. This is determined on the number and distribution of hospitals; the speed of rescue team,etc,. They are largely depending on the economic status of certain area.