Each year, Mexico City is sinking 10 centimeters, which may be imperceptible to the naked eye sinks, but in the last ten years added five feet sinking; last century was 10 meters.
The Metropolitan Cathedral has fallen a total of 12.5 meters, so that the authorities have had to invest more than 300 billion pesos to counteract the effect of the collapse.
Elsewhere in the city, there are reports of subsidence of up to 40 centimeters per year.
The main cause of these collapses is the overexploitation of aquifers or groundwater. The soil of Mexico City is composed of montmorillonite, a clay silicate water expands and contracts by the lack of it.
Rainwater does not penetrate into the underground aquifers and that man-made structures ( asphalt pavement , buildings , parks , plazas, etc. . ) Developed create waterproof , preventing water recharge and make it go directly to the drains . To lose moisture , clays and other soil sediments exhibit contraction , so that the volume of the same low level .
Lost hectares of forest per year also influence the drying zone , which prevents soil saturation , taking the surrounding forest area annually to the valley area of Mexico .
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