Regional subsidence produced by water pumping from the relatively shallow aquifers that underlie a large part of Mexico City is continuously modifying effective stress conditions within the clayey strata that constitute its subsoil and are also changing gradually the properties of these lacustrine materials. Results of seismic response analyses made taking into account these changes in soil properties, seismic hazard and seismic hazard distribution within the city will undergo significant changes in the future.
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