Subsidence at Cerro Prieto Geothermal Field and postseismic slip along the Indiviso fault from 2011 to 2016 RADARSAT‐2 DInSAR time series analysis. Issue 6 (25th March 2017)

• Record Type: Journal Article
• Authors: Samsonov, Sergey V.; Feng, Wanpeng; Fialko, Yuri
• Is Part Of: Geophysical research letters. Volume 44:Issue 6(2017)
• Page Start: 2716
• Page End: 2724
• Publication Date: 2017-03-25
• Subjects: Cerro Prieto Geothermal Field -- ground deformation -- afterslip -- El Mayor‐Cucapah earthquake -- subsidence -- DInSAR; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2017GL072690
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: We present RADARSAT‐2 Differential Interferometric Synthetic Aperture Radar (DInSAR) observations of deformation due to fluid extraction at the Cerro Prieto Geothermal Field (CPGF) and afterslip on the 2010 M 7.2 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 DInSAR 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. Key Points: Ground deformation time series in the vicinity of Cerro Prieto Geothermal Field from RADARSAT‐2 DInSAR during 2011–2016 Stress changes due to fluid extraction at Cerro Prieto Geothermal Field affected coseismic and postseismic slip on the Indiviso fault Observed afterslip on 2010 M 7.2 El Mayor‐Cucapah earthquake fault continues for 6 years after the main shock