Evaluation of Mexico City subsidence

Updated information concerning regional subsidence in Mexico City is presented. The time series and spatial distribution of the elevations of 2064 benchmarks (SACM, GDF) and other references located in the former Lake of Texcoco are presented. Extensive use was made of new geocomputing tools. Useful geodesic and topographic works made in the middle of the XIXth century are reviewed for the historic evaluation of the subsidence. Some indirect methods that could be used for a better monitoring of regional subsidence are discussed.