Abstract
Abstract. Mexico City, a large megacity with over 21 million inhabitants, is exposed to several hazards, including land subsidence, earthquakes, and flooding. Hazard assessments for each hazard type is typically treated separately and usually do not include considerations for any relations among the hazards. Our data makes it plausible for an earthquake triggering case that temporarily accelerated the subsidence rate in the metropolitan area as a result of the Mw 8.2 Tehuantepec and the Mw 7.1 Puebla, September 2017 earthquakes that affected Mexico City. Furthermore, the triggering effect induced rapid slip along previously developed shallow faults associated with subsidence. These results indicate that any future scenario of land subsidence should consider a potential triggering effect by large earthquakes. Similarly, earthquake hazard assessments should also consider potential impact on shallow faulting and fracturing associated with land subsidence.
Highlights
Mexico City is very susceptible to seismic-induced damage, because part of the city is built over a sedimentary basin with clay rich lacustrine sediments up to 400 m thick (Santoyo-Villa et al, 2006; Auvinet et al, 2017)
Not much attention has been paid to the shallow faulting associated with land subsidence that has developed on the transitional zones between the lacustrine deposits and the volcanic structures outcropping and its role as a potential risk during large earthquakes
We use satellite-acquired SAR data from the Sentinel-1 satellites provided by the European Space Agency (ESA) through the Alaska Satellite Facility SAR Data Center repository
Summary
Mexico City is one of the fastest-subsiding metropolises in the world, where subsidence rates exceed 360 mm yr−1 (Fig. 1). In the past decade subsidence has monitored by advanced satellite geodetic techniques, mainly satellite Interferometric Synthetic Aperture Radar (InSAR) and GPS (e.g. Cabral et al, 2008; López-Quiroz et al, 2009; Osmanoglu et al, 2011; Du et al, 2019). These studies have routinely detected the highest subsidence rates in the eastern sector of the city within two areas that correspond to the former Texcoco and Chalco-Xochimilco lakes (Fig. 1). Most of the previous studies focused on the city-wide subsidence signal, which is important for understanding the city’s aquifer mechanics in response to groundwater extraction Both GPS and InSAR measurements indicated limited. Temporal changes in the subsidence rate throughout the past two decades with limited seasonal variability
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