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TitleSubsidence at Cerro Prieto Geothermal Field and postseismic slip along the Indiviso fault from 2011 to 2016 RADARSAT-2 DInSAR time series analysis
AuthorSamsonov, S; Feng, W; Fialko, U
SourceGeophysical Research Letters vol. 44, issue 6, 2017 p. 2716-2724, (Open Access)
Alt SeriesNatural Resources Canada, Contribution Series 20170168
Mediapaper; on-line; digital
File formatpdf
AreaCerro Prieto; Mexico
Lat/Long WENS-115.6000 -115.0000 32.6000 32.0000
Subjectsremote sensing; radar imagery; radar methods; subsidence; deformation; fluid dynamics; earthquakes; time observations; RADARSAT-2; Differential Interferometry; Synthetic Aperture Radar (SAR)
Illustrationslocation maps; graphs
ProgramRemote Sensing Science, Methodology
Released2017 03 25
AbstractWe present RADARSAT-2 DInSAR observations of deformation due to fluid extraction at the Cerro Prieto Geothermal Field (CPGF) and afterslip on the 2010 M7.2 El Mayor-Cucapah (EMC) earthquake rupture during 2011-2016. Advanced multidimensional time-series analysis reveals subsidence at the CPGF with the maximum rate greater than 100 mm/yr accompanied by horizontal motion (radial contraction) at a rate greater than 30 mm/yr. During the same time period, more than 30 mm of surface creep occurred on the Indiviso fault ruptured by the EMC earthquake. We performed inversions of InSAR data to estimate the rate of volume changes at depth due to the geothermal production at the CPGF and the distribution of afterslip on the Indiviso fault. The maximum coseismic slip due to the EMC earthquake correlates with the Coulomb stress changes on the Indiviso fault due to fluid extraction at the CPGF. Afterslip occurs on the periphery of maximum coseismic slip areas. Time series analysis indicates that afterslip still occurs 6 years after the earthquake.
Summary(Plain Language Summary, not published)
We designed a monitoring methodology for detecting ground deformation at Cerro Prieto geothermal plant using Canadian satellite radar data. We performed numerical modelling to try to explain the source of the observed deformation. We demonstrated that anthropogenic activities at this plant contribute to stress on the seismic fault located 20 km away from the plant. This research may be of interest to other scientists and industry specializing in geotechnical engineering.