Abstract
Abstract. The city of Maceió has been historically affected by cracks and sink events in buildings and city infrastructure. Availability of a consistent Sentinel 1 Mission dataset between 2014 and 2019 allows characterizing the undergoing crustal deformation process that provokes such effects. We processed a dataset of 81 SAR scenes using the DInSAR-SBAS time-series technique, which allowed us to obtain mean velocity of deformation and deformation time series. Detected displacement patterns show subsidence concentrated in the Mundaú lagoon coast in front of Mutange, Pinheiro and Levada neighbourhoods. Inversion of the results, using analytical models, locates a sill-like source at ∼400 m depth and with a radius of ∼0.8 km. Its depth would be compatible with re-activation of the Mutange fault system, possibly related to salt mining operations in the area. Further investigation is needed to better constrain the deformation source and to identify if the observed process was active before the analysed time span.
Highlights
Multi temporal Interferometric SAR (Synthetic Aperture Radar) processing is a mature technique for characterizing crustal deformation fields in space and time (Hooper et al, 2012)
It is based in the availability of SAR scenes acquired along a time span using a consistent acquisition geometry, which means same orbits, sensor modes, and look angles
Regarding the main deformation spot, which is affecting Mutange and Pinheiro neighborhoods, cracks and differential sink are a known issue since long ago, but the phenomena intensified in March 2018. This motivated the CPRM) (Serviço Geológico do Brasil (CPRM) to perform an extensive study under several hypotheses, which is summarized in (Serviço Geológico do Brasil (CPRM), 2019a)
Summary
Multi temporal Interferometric SAR (Synthetic Aperture Radar) processing is a mature technique for characterizing crustal deformation fields in space and time (Hooper et al, 2012). It is based in the availability of SAR scenes acquired along a time span using a consistent acquisition geometry, which means same orbits, sensor modes, and look angles. First applications were demonstrated using images taken by the ERS, Radarsat-1 and ENVISAT Missions during nearly two decades between 1991 and 2011 Those missions were programmed to acquire data at user’s request, or following a socalled background mission in absence of specific requests. In South America, for example, only a few ERS scenes were taken until 2001, and even after that year, the background missions covered the Andean region but not the coastal one
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