8Land_subsidence_Mexico_City_Ctools_March_19

8Land_subsidence_Mexico_City_Ctools_March_19 - Land...

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Land subsidence in Mexico city The leaning aspect of big buildings such as the “Torre Latinoamericana” and the big Cathedral suggest to the uninformed tourist that visit the city for the first time, that those are the consequences of an old earthquake or volcanic eruption , natural hazards typical of this area. Are these leaning buildings really the consequence of natural hazards? Not really… They are due to a very important land subsidence . Subsidence in Mexico city is closely related to the history (past and present) of the city. - drainage of surrounding lakes - excessive withdrawal of groundwater
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Lacustrine sediments (aquitards) Sediments that are deposited in lakes (clays, for example) Alluvial deposits (aquifers) Sediments that are deposited by rivers (sand, gravel, for example) Mexico City Valley is made of a mixture of lacustrine and alluvial deposits.
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All started during the Aztec empire, in 1370… Then, the Spanish arrived, in 1521… And today, and since the beginning of the last
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8Land_subsidence_Mexico_City_Ctools_March_19 - Land...

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