Quantitative analysis of subsidence in the Southwestern Sabana de Bogotá using InSAR geodesy
Submitted: 2024-03-12
|Accepted: 2024-10-07
|Published: 2024-10-21
Copyright (c) 2024 Fredy Diaz-Mila, Lusette Karime Escobar-Rey, Héctor Mora-Páez
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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Keywords:
subsidence, InSAR, Sabana de Bogotá, geodesy
Supporting agencies:
Abstract:
Subsidence is a geological phenomenon that consists of the gradual sinking of the earth’s surface, which can be caused by natural actions or by human activity. The Satellite Applications Group for the Study of Earth Dynamics (ASEDT) of the Geohazards Directorate of the Colombian Geological Survey, under the framework of the GeoRED project (Geodesy: Deformation Studies Network), using InSAR (Interferometric Synthetic Aperture Radar) geodesy techniques, has quantified the phenomenon of subsidence in 13 municipalities that are part of the Sabana de Bogotá, using Sentinel-1 interferometric images (184 of descending orbit and 225 of ascending orbit), for the period from October 2014 to December 2021. A total of 840 interferograms were generated, of which 345 correspond to ascending orbits and 495 to descending orbits, which allowed estimating the values of the movements along the line-of-sight (LOS) for each set of images, and subsequently using combination techniques the vertical and horizontal east-west velocities were estimated. One of the municipalities with the greatest subsidence in the study area is El Rosal, where a vertical displacement rate of up to 12 cm/year is estimated, i.e. a value approximately four times higher than the estimate made by Mora-Páez et al. (2021) in the city of Bogotá.
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