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• W2557370263 abstract "Most of the urban areas located in the lacustrine or fluvio-lacustrine depressions of the central sector of the Mexican Volcanic Belt (MVB), such as Morelia, Celaya, Aguascalientes, Salamanca and Queretaro, during the last two decades registered differential ground subsidence. To understand this phenomenon and to identify the main causes that generate it, geological investigations were carried out using different methodologies. The results of the investigations have related the ground settlements to the over-exploitation of groundwater resources that, generating a decrease of the pore water pressure in the solid phase of the soil, causes the consolidation of the lacustrine and fluviolacustrine sediments. The combination of groundwater withdrawal with the presence of regional and local systems of normal faults have been addressed as the controlling factors of the identified ground settlements. Indeed, the main damaged buildings and structures have been detected along preferential directions which are parallel to the regional fault system. In this paper we present the preliminary results of an InSAR analysis carried out over the main cities of the MVB, some of which are included in the UNESCO World Heritage List. The analysis aimed at detecting the spatial patterns and the annual rates of subsidence, as well as to identify periods in which land subsidence has been intensified by the conjugation of other phenomena such as La Nina, a meteorological phenomenon that caused a drought period. To achieve these objectives, we used ENVISAT SAR data spanning the period 20032006, acquired within an ESA Cat-1 project. The analysis revealed the presence of ground displacements along the linear structures identified in the field, reaching velocities up to 5-6 cm/year. To improve the understanding of the on-going phenomena, the displacement maps provided by the InSAR processing have been analyzed along with ancillary data, such as piezometric maps, geologic maps, and validated with the available in-situ measurements. The InSAR analysis confirmed how the tectonic structures of the MVB control the ground settlements. Furthermore, the obtained deformation maps enabled to extend the mapping of the main faults even over urban areas not yet identified by field surveys, due to the still scarce superficial evidences." @default.
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• W2557370263 date "2007-07-01" @default.
• W2557370263 modified "2023-09-30" @default.
• W2557370263 title "STRUCTURALLY-CONTROLLED URBAN SUBSIDENCE ALONG THE MEXICAN VOLCANIC BELT (MVB) MONITORED BY INSAR" @default.
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