Postseismic Ground Deformation Following the September 2010 Darfield, New Zealand, Earthquake From TerraSAR-X, COSMO-SkyMed, and ALOS InSAR

We evaluate early postseismic deformation after the 2010 Darfield, New Zealand, earthquake documented by radar satellite interferometry observations. Applying interferometric techniques to TerraSAR-X, COSMO-SkyMed, and ALOS data, we derive evidence for a variety of coupled solid-fluid postseismic processes after the Darfield event. The contractional jog of the Greendale Fault shows a time-dependent subsidence signal during the first ~6 months after the event. We detect a dominant subsidence signal in the epicentral area of the Charing Cross fault and also observe a narrow zone (<; 15km) of right-lateral shear along the eastern end of the Greendale Fault, a likely indication of postseismic afterslip process that is operative there after the event.