Influence Of Ground Water Extraction In The
Seismic Hazard Of Mexico City
Author(s)
J. Avilés, L. E. Pérez-Rocha & H. R. Aguilar
Abstract
The influence of ground water extraction in the seismic hazard of Mexico City is
examined. Available information on settlements of the land surface is used to
evaluate the subsidence effects on the predominant ground period. Microzoning
maps, as a function of this relevant site parameter, are constructed for the present
and future geotechnical conditions. Based on these maps, site-specific design
spectra throughout the whole city are determined by applying seismic code
provisions. It is found that the regional subsidence will generally be beneficial
for structures with fundamental period longer that the current period of the site,
but detrimental if the structure period is shorter than the site period.
Keywords: design spectra, ground water extraction, microzoning map, regional
subsidence, seismic hazard.
1 Introduction
Extensive ground-water exploitation has been identified as the main cause of
land subsidence in Mexico City. The phenomenon has caused large settlements
in the past, up to 10 m at some areas of the city. Subsidence of the city was
studied for the first time by Carrillo [1], showing a clear dependence with the
amount and rate of water extraction from artesian wells. Since then, many efforts
have been made to understand the phenomenon and mitigate its consequences. A
review of these efforts can be found in Ovando-Shelley et al. [2]. These authors
have studied the consolidation process in the central part of the city using the
well-known Terzaghi’s consolidation theory. They showed that exploitation of
the aquifers under the lacustrine clays is reflected not only on the gradual
Keywords
design spectra, ground water extraction, microzoning map, regional
subsidence, seismic hazard.
Related Book
Other papers in this volume
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