| Title | New insights into fast ground subsidence in southern Saskatchewan from modeling of RADARSAT-2 DInSAR measurements |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Samsonov, S V ;
González, P J; Tiampo, K F; d'Oreye, N; Czarnogorska, M |
| Source | Geomatics Canada, Scientific Presentation no. 2, 2014, 1 sheet, https://doi.org/10.4095/295561  Open Access |
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| Year | 2014 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | Saskatchewan |
| NTS | 72O/13; 72O/14; 72O/15; 72O/16; 73B/01; 73B/02; 73B/03; 73B/04; 73B/05; 73B/06; 73B/07; 73B/08 |
| Area | Rice Lake; Saskatoon |
| Lat/Long WENS | -108.0000 -106.0000 52.5000 51.7500 |
| Subjects | geophysics; structural geology; remote sensing; satellite imagery; subsidence; subsidence rates; deformation; modelling; DInSAR; Radarsat-2 |
| Illustrations | location maps; plots; satellite images |
| Released | 2014 12 10 |
| Abstract | With Radarsat-2 Differential Interferometric Synthetic Aperture Radar (DInSAR) we observed a fast (approximately -10 cm/year) ground subsidence in southern Saskatchewan, affecting some limited areas
located between Rice Lake and the city of Saskatoon. The deformation maps were calculated using 2008-2013 RADARSAT-2 SAR data from two different beams: Multi-Looked Fine and Standard. We performed standard InSAR analysis and reconstructed two
dimensional, east-west and vertical time series of ground deformation with the Multidimensional Small Baseline subset (MSBAS) method (Samsonov and d'Oreye, 2012). Analysis of the MF3F and S3 time series revealed that the subsidence rate is nearly
constant during the entire observation period, which suggests that it is not related to groundwater withdrawal that should have been affected by seasonal variations. We further selected highly coherent ascending and descending interferograms spanning
November 2011 - April 2011 for simple elastic modelling. The inversion solves for several parameters, including source depth, precise location and volume change rate. Two regions of subsidence with nearly circular shapes were analyzed. The elastic
modelling of the observed deformation is consistent with volume changes of spherical and/or sill-like sources at source depths ranging from 600 to 1500 m. We also investigated the impact of this subsidence on the redistribution of surface water
levels and its impact on farming. |
| GEOSCAN ID | 295561 |
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