Elastic models of seismic failure in the Valley of Mexico |
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| Authors: | A Uribe-Carvajal E Nyland |
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| Institution: | (1) Institute of Earth and Planetary Physics, Department of Physics, University of Alberta, T6G 2J1 Edmonton, Canada |
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| Abstract: | Restricted parts of the Valley of Mexico have been plagued by swarms of small earthquakes during recent years. The cause of these events is puzzling, but they may relate to massive artificial changes in the hydrology of the lake-bed which underlies most of Mexico City. If the valley responds elastically, plane strain finite element calculations can be used to relate geologic and seismic structure to observed seismicity and overall stability of the valley. These calculations show that unstable zones and areas of local seismicity coincide if the triggering mechanism of the seismicity is related to variations of pore pressure and water load.In order to make such a connection it is necessary to ascribe the generating mechanism of the seismicity to the density and elastic modulus anomalies associated with the valley structure, and to suggest that the phenomenon that triggers this seismicity is related to changes in water content of the near surface formations. |
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| Keywords: | Finite element modelling Seismicity of Mexico Microzonation |
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