Mexico City, Mexico. The Landsat Thematic Mapper data shows the shortwave infrared, infrared,
and visible (green) channels for the region around Mexico City. USGS Digital
Elevation Map data shows the rugged, steep terrain which surrounds the city.
Mexico Citys position with respect to these mountains results in air from the
city getting trapped so that smog accumulates. The city is built on land formed
from the erosion of the mountains, so that buildings and structures in the city
rest in sedimentary rocks rather than bedrock. This leaves buildings more
vunerable to damage from earthquakes.