Abstract
In this study deformation processes in northern Zona Metropolitana del Valle de Mexico (ZMVM) are evaluated by means of advanced multi-temporal interferometry. ERS and ENVISAT time series, covering approximately an 11-year period (between 1999 and 2010), were produced showing mainly linear subsidence behaviour for almost the entire area under study, but increasing rates that reach up to 285 mm/yr. Important non-linear deformation was identified in certain areas, presumably suggesting interaction between subsidence and other processes. Thus, a methodology for identification of probable fracturing zones based on discrimination and modelling of the non-linear (quadratic function) component is presented. This component was mapped and temporal subsidence evolution profiles were constructed across areas where notable acceleration (maximum of 8 mm/yr2) or deceleration (maximum of −9 mm/yr2) is found. This methodology enables location of potential soil fractures that could impact relevant infrastructure such as the Tunel Emisor Oriente (TEO) (along the structure rates exceed 200 mm/yr). Additionally, subsidence behaviour during wet and dry seasons is tackled in partially urbanized areas. This paper provides useful information for geological risk assessment in the area.
Highlights
IntroductionThe Valley of Mexico is a highlands plateau in Central Mexico which is surrounded by mountains of volcanic origin and characterized by the common presence of faults and high seismic activity [1]
The Valley of Mexico is a highlands plateau in Central Mexico which is surrounded by mountains of volcanic origin and characterized by the common presence of faults and high seismic activity [1].Subsidence in the region occurs as a result of intensive groundwater extraction and constitutes one of the most harmful and costly hazards impacting the Valley of Mexico
The analysis focuses on two profiles along and approximately perpendicular to the hydraulic drainage infrastructure of the Tunel Emisor Oriente (TEO), with a 7.5 m diameter, 62 km long and with 24 vertical shafts distributed along its length
Summary
The Valley of Mexico is a highlands plateau in Central Mexico which is surrounded by mountains of volcanic origin and characterized by the common presence of faults and high seismic activity [1]. Subsidence in the region occurs as a result of intensive groundwater extraction and constitutes one of the most harmful and costly hazards impacting the Valley of Mexico. In addition to the regional systems of faults identified by various scientists (e.g., [2,3,4]), fracturing risk zones might be induced by differential sinking rates. Subsidence and its associated phenomena cause damage to infrastructure, worsen the water quality and increase flooding risks (e.g., [1,5,6]). The Valley of Mexico subsidence is a complex process that varies spatially and temporally. Several multidisciplinary studies have been focused on the south of the Zona Metropolitana del
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