Space-time evolution of land subsidence in the National Capital Region of India using ALOS-1 and Sentinel-1 SAR data: Evidence for groundwater overexploitation

•ALOS-1 and Sentinel-1 datasets are utilized to compute vertical land subsidence.•Space-time evolution of subsidence over NCR, India between 2007 and 10 and Nov.2014–19.•Three major subsidence zones driven by overexploitation of groundwater.•Incongruous variations in extent and magnitude of subsidence over the two periods.•Elastic and inelastic deformation of aquifer systems in adjacent regions.