New Challenges in Seismic Design - Earthquake Engineering for Structural Design - page 5

Urban population
(billions)

4.5

4

3.5

3

Developing
Countries

2.5

2

1.5

1

Developed
Countries

0.5

0

1960 1980 2000 2020

Figure1.1 Global urbanization: Increase of world's population in developed
and developing countries (modified after Bilham, 2000)

Table1.1 Principal Agglomerations in the World (at the level of 2005)

Definition Population Total Situated in Percentage
Cities million number seismic areas %
__________________________________________________________________
Super mega > 20 5 4 80
Mega > 10 19 15 79
Super > 5 35 19 54
Big > 2 128 78 61
Important > 1 241 150 62
__________________________________________________________________
Total 428 266 62